Theresa May and her husband Philip leave Downing Street, on her last day in office as Britain's Prime Minister, in London, Britain July 24, 2019. REUTERS/Peter Nicholls

Theresa May and her husband Philip wave outside Downing Street, on her last day in office as Britain's Prime Minister, in London, Britain July 24, 2019. REUTERS/Hannah Mckay

Theresa May, next to her husband Philip, arrives to deliver a speech outside Downing Street, on her last day in office as Britain's Prime Minister, in London, Britain July 24, 2019. REUTERS/Hannah Mckay

Theresa May stands next to her husband Philip as he waves outside Downing Street, on her last day in office as Britain's Prime Minister, in London, Britain July 24, 2019. REUTERS/Toby Melville

Theresa May and her husband Philip leave Downing Street, on her last day in office as Britain's Prime Minister, in London, Britain July 24, 2019. REUTERS/Toby Melville

Britain's Prime Minister Theresa May leave number 10 Downing Street, on her last day in office as Prime Minister, in London, Britain July 24, 2019. REUTERS/Toby Melville