Milkman Darren Clark stocks his milk float ahead of his delivery round at a dairy farm in Cheshunt, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay

Milkman Darren Clark makes a home delivery of milk in the town of Sawbridgeworth, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 22, 2020. Picture taken April 22, 2020. REUTERS/Hannah McKay

Milkman Darren Clark makes a home delivery of bread and milk in the town of Sawbridgeworth, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 22, 2020. Picture taken April 22, 2020. REUTERS/Hannah McKay

Milkman Darren Clark collects empty milk bottles from a house on his morning delivery round in the town of Sawbridgeworth, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 22, 2020. Picture taken April 22, 2020. REUTERS/Hannah McKay

Milkman Darren Clark begins his morning delivery round in the town of Sawbridgeworth, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 22, 2020. Picture taken April 22, 2020. REUTERS/Hannah McKay

Milkman Darren Clark makes a home delivery during his delivery round in the town of Albury, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay

Milkman Darren Clark makes a home delivery of bread and dairy products during his delivery round in the town of Albury, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay

Milkman Darren Clark makes a home delivery during his delivery round in the town of Albury, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay

Milkman Darren Clark makes a home delivery of milk during his delivery round in the town of Albury, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay

Milkman Darren Clark makes a home delivery of milk during his delivery round in the town of Albury, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay TPX IMAGES OF THE DAY

Milkman Darren Clark collects crates of milk bottles to stock his milk float ahead of his delivery round at a dairy farm in Cheshunt, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay

Milkman Darren Clark begins his delivery round in the town of Ware, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay

Milkman Darren Clark speaks to other milkmen ahead of their delivery rounds at a dairy farm in Cheshunt, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay

Milkman Darren Clark checks an order in his milk float during his delivery round in the town of Ware, as business for his company 'Mr Milk' booms, as the spread of the coronavirus disease (COVID-19) continues in Hertfordshire, Britain, April 26, 2020. Picture taken April 26, 2020. REUTERS/Hannah McKay

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 27, 2019 Northern Ireland's Darren Clarke during the third round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 27, 2019 Northern Ireland's Darren Clarke in action during the third round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 27, 2019 Northern Ireland's Darren Clarke in action during the third round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 26, 2019 Northern Ireland's Darren Clarke in action during the second round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 26, 2019 Northern Ireland's Darren Clarke gestures during the second round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke on the 7th hole during the first round Action Images via Reuters/Jason Cairnduff

Golf - The Senior Open Championship - Royal Lytham & St Annes Golf Club, Lytham St Annes, Britain - July 25, 2019 Northern Ireland's Darren Clarke on the 7th hole during the first round Action Images via Reuters/Jason Cairnduff

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke hits the first tee shot of the Open Championship during the first round REUTERS/Jason Cairnduff

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke before hitting the first tee shot of the Open Championship during the first round REUTERS/Paul Childs

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke before the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke before the start of the first round REUTERS/Paul Childs

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke hits the first tee shot of the Open Championship during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke hits the first tee shot of the Open Championship during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke before hitting the first tee shot of the Open Championship during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke hits the first tee shot of the Open Championship during the first round REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke hits the first tee shot of the Open Championship during the first round REUTERS/Paul Childs

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke hits the first tee shot of the Open Championship during the first round REUTERS/Jason Cairnduff

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 18, 2019 Northern Ireland's Darren Clarke before the start of the first round REUTERS/Paul Childs

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 17, 2019 Northern Ireland's Darren Clarke and Australia's Adam Scott during practice REUTERS/Paul Childs

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 17, 2019 Northern Ireland's Darren Clarke during practice REUTERS/Paul Childs

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 17, 2019 Northern Ireland's Darren Clarke during practice REUTERS/Paul Childs

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 17, 2019 Australia's Adam Scott and Northern Ireland's Darren Clarke during practice REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 17, 2019 Australia's Adam Scott and Northern Ireland's Darren Clarke during practice REUTERS/Ian Walton

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 15, 2019 Northern Ireland's Darren Clarke during a press conference REUTERS/Paul Childs

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 15, 2019 Northern Ireland's Darren Clarke during a press conference REUTERS/Paul Childs

Golf - The 148th Open Championship - Royal Portrush Golf Club, Portrush, Northern Ireland - July 15, 2019 Northern Ireland's Darren Clarke during a press conference REUTERS/Paul Childs