Pupils of Gordonstoun School stand during a minute's silence on the day of the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Elgin, Scotland, Britain, April 17, 2021. REUTERS/Russell Cheyne

The coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, is carried during his funeral, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Adrian Dennis/Pool via REUTERS

Britain's Prince Harry, Duke of Sussex, follows the hearse, a specially modified Land Rover, on the grounds of Windsor Castle during funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

Members of the Royal Family stand next to the hearse, a specially modified Land Rover, on the grounds of Windsor Castle during funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

MotoGP - Portuguese Grand Prix - Algarve International Circuit, Portimao, Portugal - April 17, 2021 Pramac Racing's Johann Zarco and Sky VR46 Avintia's Luca Marini in action during qualifying REUTERS/Pedro Nunes

The hearse, a specially modified Land Rover, arrives at St. George's Chapel for the funeral service of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Gareth Fuller/Pool via REUTERS

Members of the Royal Family follow the hearse, a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Adrian Dennis/Pool via REUTERS

The Land Rover Defender carrying the coffin of Britain's Prince Philip is followed by members of the Royal family as it makes its way to St George's Chapel, Windsor Castle, Berkshire, for his funeral, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS

Members of the Royal Family follow the hearse, a specially modified Land Rover, on the grounds of Windsor Castle during funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

Britain's Prince Harry, Duke of Sussex looks on as he attends the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

Pupils of Gordonstoun School stand during a minute's silence on the day of the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Elgin, Scotland, Britain, April 17, 2021. REUTERS/Russell Cheyne

The coffin of Britain's Prince Philip is placed in a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Adrian Dennis/Pool via REUTERS

Britain's Prince William, Duke of Cambridge and Britain's Prince Harry, Duke of Sussex, follow the hearse, a specially modified Land Rover, on the grounds of Windsor Castle during funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

Britain's Camilla, Duchess of Cornwall and Britain's Catherine, Duchess of Cambridge arrive for the funeral of Britain's Prince Philip, who died at the age of 99, at St George's Chapel, in Windsor, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS

Members of the Royal Family follow the hearse, a specially modified Land Rover (not pictured), during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Adrian Dennis/Pool via REUTERS

Britain's Camilla, Duchess of Cornwall and Britain's Catherine, Duchess of Cambridge arrive for the funeral of Britain's Prince Philip, who died at the age of 99, at St George's Chapel, in Windsor, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS

Britain's Camilla, Duchess of Cornwall and Britain's Catherine, Duchess of Cambridge arrive for the funeral of Britain's Prince Philip, who died at the age of 99, at St George's Chapel, in Windsor, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge, looks on during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

MotoGP - Portuguese Grand Prix - Algarve International Circuit, Portimao, Portugal - April 17, 2021 Petronas Yamaha SRT's Valentino Rossi, LCR Honda Castrol's Alex Marquez, Tech3 KTM Factory Racing's Danilo Petrucci and Aprilia Racing Team Gresini's Lorenzo Savadori in action during qualifying REUTERS/Pedro Nunes

Britain's Prince Harry, Duke of Sussex looks on as he attends the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

Queen Elizabeth II and Britain's Prince Andrew during the funeral of Britain's Prince Philip, who died at the age of 99, in St George's Chapel, Windsor Castle, Britain, April 17, 2021. Yui Mok/Pool via REUTERS

Britain's Britain's Prince Andrew, Duke of York, Britain's Prince Edward, Earl of Wessex, and Britain's Prince Harry, Duke of Sussex attend the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

The hearse, a specially modified Land Rover, carrying the coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, drives near St George's Chapel on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. REUTERS/Hannah Mckay

Members of the Royal Family enter St. George's Chapel for a funeral service of Britain's Prince Philip, husband of Queen Elizabeth, in Windsor, Britain, April 17, 2021. Justin Tallis/Pool via REUTERS

Britain's Queen Elizabeth II takes her seat for the funeral of Britain's Prince Philip, who died at the age of 99, at St George's Chapel, in Windsor, Britain, April 17, 2021. Jonathan Brady/Pool via REUTERS

Britain's Prince Charles and members of the Royal Family follow the hearse (not pictured), a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Ian Vogler/Pool via REUTERS

The coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, is taken into St. George's Chapel for a funeral service, in Windsor, Britain, April 17, 2021. Justin Tallis/Pool via REUTERS

A child runs outside Windsor Castle holding a Union Jack flag during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. REUTERS/Peter Cziborra

Members of the Royal Family follow the hearse, a specially modified Land Rover, on the grounds of Windsor Castle during funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Gareth Fuller/Pool via REUTERS

Britain's Queen Elizabeth II looks at the coffin of her husband, Britain's Prince Philip, who died at the age of 99, during his funeral service at St George's Chapel, in Windsor, Britain, April 17, 2021. Jonathan Brady/Pool via REUTERS TPX IMAGES OF THE DAY

Britain's Camilla, Duchess of Cornwall is seen in a car following the hearse on the grounds of Windsor Castle during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Alastair Grant/Pool via REUTERS

Tennis - ATP Masters 1000 - Monte Carlo Masters - Monte-Carlo Country Club, Roquebrune-Cap-Martin, France - April 17, 2021 Russia's Andrey Rublev with Norway's Casper Ruud after winning his semi final match REUTERS/Eric Gaillard

Britain's Prince Charles and Britain's Prince Harry, Duke of Sussex, follow the hearse, a specially modified Land Rover, on the grounds of Windsor Castle during funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Gareth Fuller/Pool via REUTERS

Britain's Prince William, Duke of Cambridge and Prince Harry, Duke of Sussex walk behind the hearse on the grounds of Windsor Castle during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Adrian Dennis/Pool via REUTERS

Members of the military stand guard next to the Bentley State Limousine on the day of the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Adrian Dennis/Pool via REUTERS

Tennis - ATP Masters 1000 - Monte Carlo Masters - Monte-Carlo Country Club, Roquebrune-Cap-Martin, France - April 17, 2021 Russia's Andrey Rublev celebrates winning his semi final match against Norway's Casper Ruud REUTERS/Eric Gaillard

Britain's Catherine, Duchess of Cambridge, attends the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

Members of the military salute the hearse, a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Adrian Dennis/Pool via REUTERS

Members of the Royal Family follow the hearse, a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Adrian Dennis/Pool via REUTERS

Anselm Lenz, one of the organisers of the protest against coronavirus disease (COVID-19) measures speaks in Berlin, Germany April 17, 2021. REUTERS/Christian Mang

Members of the Royal Family follow the hearse (not pictured), a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Paul Edwards/Pool via REUTERS

MotoGP - Portuguese Grand Prix - Algarve International Circuit, Portimao, Portugal - April 17, 2021 Monster Energy Yamaha MotoGP's Fabio Quartararo in action during qualifying REUTERS/Pedro Nunes

Members of the military carry the coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Adrian Dennis/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge, looks on during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

The coffin is carried into St George's Chapel during the funeral of Britain's Prince Philip, who died at the age of 99, at Windsor Castle, Britain, April 17, 2021. Yui Mok/Pool via REUTERS

The coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, is taken into St. George's Chapel for a funeral service, in Windsor, Britain, April 17, 2021. Kirsty Wigglesworth/Pool via REUTERS

Members of the Royal family stand outside St. George's Chapel, ahead of the funeral service for Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Kirsty Wigglesworth/Pool via REUTERS

A demonstrator is detained by policemen during a protest against coronavirus disease (COVID-19) measures in Berlin, Germany April 17, 2021. REUTERS/Christian Mang

Tennis - ATP Masters 1000 - Monte Carlo Masters - Monte-Carlo Country Club, Roquebrune-Cap-Martin, France - April 17, 2021 Russia's Andrey Rublev reacts during his semi final match against Norway's Casper Ruud REUTERS/Eric Gaillard

Tennis - ATP Masters 1000 - Monte Carlo Masters - Monte-Carlo Country Club, Roquebrune-Cap-Martin, France - April 17, 2021 Russia's Andrey Rublev reacts during his semi final match against Norway's Casper Ruud REUTERS/Eric Gaillard

The hearse, a specially modified Land Rover, Britain's Prince Charles and members of the Royal Family walk near St George's Chapel during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. REUTERS/Hannah McKay/Pool TPX IMAGES OF THE DAY

A demonstrator is detained by policemen during a protest against coronavirus disease (COVID-19) measures in Berlin, Germany April 17, 2021. REUTERS/Christian Mang

Members of the Royal Family follow the hearse (not pictured), a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Ian Vogler /Pool via REUTERS

Members of the Royal Family follow the hearse, a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Paul Edwards/Pool via REUTERS

Britain's Prince William, Peter Phillips and Britain's Prince Harry walking in the procession at Windsor Castle, Berkshire, during the funeral of Britain's Prince Philip, who died at the age of 99, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge, looks on during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS

MotoGP - Portuguese Grand Prix - Algarve International Circuit, Portimao, Portugal - April 17, 2021 Tech3 KTM Factory Racing's Iker Lecuona in action during qualifying REUTERS/Pedro Nunes

MotoGP - Portuguese Grand Prix - Algarve International Circuit, Portimao, Portugal - April 17, 2021 Red Bull KTM Factory Racing's Brad Binder and Tech3 KTM Factory Racing's Danilo Petrucci in action during qualifying REUTERS/Pedro Nunes

Britain's Prince William and Britain's Prince Harry walking in the procession at Windsor Castle, Berkshire, during the funeral of Britain's Prince Philip, who died at the age of 99, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS

Britain's Queen Elizabeth II takes her seat for the funeral of Britain's Prince Philip, who died at the age of 99, at St George's Chapel, in Windsor, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS

Pupils and staff of Gordonstoun School cast a wreath into the Moray Firth on the day of the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, at Hopeman Harbour, Elgin, Scotland, Britain, April 17, 2021. REUTERS/Russell Cheyne

Britain's Prince Charles walks behind the hearse, a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. REUTERS/Hannah McKay/Pool TPX IMAGES OF THE DAY

Britain's Catherine, Duchess of Cambridge is seen in a car following the hearse on the grounds of Windsor Castle during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Alastair Grant/Pool via REUTERS TPX IMAGES OF THE DAY

People observe a minute's silence during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, at the Duke of Edinburgh pub in Winkfield near Windsor, Britain, April 17, 2021. REUTERS/Peter Nicholls

The naval cap and flowers lay on the coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, during his funeral, in front of St George's Chapel on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Kirsty Wigglesworth/Pool via REUTERS

A member of the military stands on the grounds of Windsor Castle on the day of the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. REUTERS/Hannah McKay/Pool TPX IMAGES OF THE DAY

People gather outside Windsor Castle during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. REUTERS/Peter Cziborra

The coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, is taken from the hearse, a specially modified Land Rover, to be carried into St. George's Chapel for a funeral service, in Windsor, Britain, April 17, 2021. Kirsty Wigglesworth/Pool via REUTERS

Cold water swimmers observe a minute's silence during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, at the Brockwell Lido in London, Britain, April 17, 2021. REUTERS/Tom Nicholson

Britain's Prince Charles and members of the Royal Family walk behind the hearse on the grounds of Windsor Castle during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Alastair Grant/Pool via REUTERS TPX IMAGES OF THE DAY

People observe a minute's silence during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, outside Buckingham Palace, London, Britain, April 17, 2021. REUTERS/Paul Childs

Britain's Prince Philip's coffin is carried into his funeral service at St George's Chapel, Windsor Castle, in Windsor, Britain, April 17, 2021. Danny Lawson/Pool via REUTERS

Members of the Royal family follow the hearse, a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Leon Neal/Pool via REUTERS

The coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, is taken into St. George's Chapel for a funeral service, in Windsor, Britain, April 17, 2021. Justin Tallis/Pool via REUTERS

London Black Cab taxi drivers observe a minute's silence during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on The Mall in London, Britain, April 17, 2021. REUTERS/Henry Nicholls

Britain's Prince William and Britain's Prince Harry walking in the procession at Windsor Castle, Berkshire, during the funeral of Britain's Prince Philip, who died at the age of 99, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS

The coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, is taken into St. George's Chapel for a funeral service, in Windsor, Britain, April 17, 2021. Kirsty Wigglesworth/Pool via REUTERS TPX IMAGES OF THE DAY

Members of the Royal Family follow the hearse, a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. REUTERS/Hannah McKay/Pool

Britain's Prince William and Britain's Prince Harry follow the hearse, a specially modified Land Rover, towards St. George's Chapel, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Alastair Grant/Pool via REUTERS TPX IMAGES OF THE DAY

Britain's Queen Elizabeth II takes her seat for the funeral of Britain's Prince Philip, who died at the age of 99, at St George's Chapel, in Windsor, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS TPX IMAGES OF THE DAY

Britain's Queen Elizabeth attends the funeral of her husband, Britain's Prince Philip, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Leon Neal/Pool via REUTERS TPX IMAGES OF THE DAY

The coffin of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, arrives at St George's Chapel on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. Kirsty Wigglesworth/Pool via REUTERS TPX IMAGES OF THE DAY

General view of the military bands parade on the day of the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, near Windsor Castle in Windsor, Britain, April 17, 2021. Kirsty O'Connor/Pool via REUTERS TPX IMAGES OF THE DAY

A woman holds a message and a Union Jack flag at Wellington Arch, on the day of the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, near Buckingham Palace, in London, Britain, April 17, 2021. REUTERS/Paul Childs

People watch the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on a smartphone, in Windsor, near London, Britain April 17, 2021. REUTERS/Carl Recine