Waitrose distribution centre is pictured, amid the coronavirus disease (COVID-19) outbreak, in Milton Keynes, Britain August 3, 2020. REUTERS/Matthew Childs

Waitrose distribution centre is pictured, amid the coronavirus disease (COVID-19) outbreak, in Milton Keynes, Britain August 3, 2020. REUTERS/Matthew Childs

Waitrose distribution centre is pictured, amid the coronavirus disease (COVID-19) outbreak, in Milton Keynes, Britain August 3, 2020. REUTERS/Matthew Childs

Waitrose distribution centre is pictured, amid the coronavirus disease (COVID-19) outbreak, in Milton Keynes, Britain August 3, 2020. REUTERS/Matthew Childs

People follow social distancing rules as they queue outside a Waitrose store in Harpenden as the spread of the coronavirus disease (COVID-19) continues, Harpenden, Britain, March 28, 2020. REUTERS/Peter Cziborra

Waitrose trolleys are seen at a store in Harpenden as the spread of the coronavirus disease (COVID-19) continues, Harpenden, Britain, March 28, 2020. REUTERS/Peter Cziborra

People follow social distancing rules as they queue outside a Waitrose store in Harpenden as the spread of the coronavirus disease (COVID-19) continues, Harpenden, Britain, March 28, 2020. REUTERS/Peter Cziborra

People follow social distancing rules as they queue outside a Waitrose supermarket as the spread of the coronavirus disease (COVID-19) continues, in Northwich, Britain, March 27, 2020. REUTERS/Molly Darlington

A driver packs away boxes after delivering Waitrose groceries to a house in Hackney, London, Britain, as the spread of the coronavirus disease (COVID-19) continues, March 24, 2020. REUTERS/Simon Newman

A dedicated NHS checkout is seen at a Waitrose supermarket in Berkhamsted, Britain March 24, 2020. REUTERS/Paul Childs

A dedicated NHS checkout is seen at a Waitrose supermarket in Berkhamsted, Britain March 24, 2020. REUTERS/Paul Childs

People stand apart as they follow social distancing while they queue outside a Waitrose shop in Kensington, London as the spread of the coronavirus disease (COVID-19) continues, London, Britain, March 24, 2020. REUTERS/Hannah McKay

People stand apart as they follow social distancing while they queue outside a Waitrose shop in Kensington, London as the spread of the coronavirus disease (COVID-19) continues, London, Britain, March 24, 2020. REUTERS/Hannah McKay

People queue outside of a Waitrose supermarket in St Albans, as the spread of the coronavirus disease (COVID-19) continues, Britain, March 19, 2020. REUTERS/Matthew Childs

Empty shelves of toilet roll and tissue are seen inside a Waitrose supermarket, as the number of coronavirus cases grow around the world, in London, Britain, March 15, 2020. REUTERS/Matthew Childs

A woman wearing a protective mask puts a bag of pasta in her shopping cart at supermarket Waitrose in London, Britain, March 13, 2020. REUTERS/Marika Kochiashvili

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS TPX IMAGES OF THE DAY

Britain's Prince Charles unveils a plaque during the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles unveils a plaque during the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles unveils a plaque during the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

The Plaque unveiled by Prince Charles, Prince of Wales during the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles unveils a plaque during the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles arrives for the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Prince Charles attends the opening of Waitrose & Partners Food Innovation Studio in Bracknell, Britain April 4, 2019. Stuart Wilson/Pool via REUTERS

Britain's Queen Elizabeth looks at products on the shelves at a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool TPX IMAGES OF THE DAY

Britain's Queen Elizabeth looks at products on the shelves at a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool TPX IMAGES OF THE DAY

Britain's Queen Elizabeth visits a Waitrose supermarket in the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth looks at food hampers during a visit to a Waitrose supermarket in the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Prince Philip (L), and Camilla, Duchess of Cornwall look at food hampers during a visit to a Waitrose supermarket in the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

(L-R) Britain's Queen Elizabeth, Prince Philip, Prince Charles and Camilla, Duchess of Cornwall look at food hampers during a visit to a Waitrose supermarket in the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth visits a Waitrose supermarket in the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth visits a Waitrose supermarket in the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Camilla, Duchess of Cornwall meets staff at a Waitrose supermarket during an official visit to Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth leaves a Waitrose supermarket in the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth meets staff at a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth meets staff at a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth looks at products on the shelves at a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth looks at products on the shelves at a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth looks at products on the shelves at a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth looks at products on the shelves at a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth arrives to look around a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool

Britain's Queen Elizabeth arrives to look around a Waitrose supermarket during a visit to the town of Poundbury, Britain October 27, 2016. REUTERS/Justin Tallis/Pool