A mourner brings flowers to Buckingham Palace after it was announced that Britain's Prince Philip, husband of Queen Elizabeth, has died at the age of 99, in London, Britain, April 9, 2021. Britain was mourning Prince Philip who died on Friday but people were asked not to gather in crowds or to lay flowers at royal palaces due to distancing guidelines imposed to stem the spread of coronavirus. REUTERS/Hannah McKay

A man speaks and gestures as he brings flowers to Buckingham Palace after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in London, Britain, April 9, 2021. Philip, Queen Elizabeth's husband who helped modernise the monarchy and steer the British royal family through repeated crises during seven decades of service, died on Friday at Windsor Castle. He was 99. REUTERS/Henry Nicholls

A mourner prays outside Buckingham Palace after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in London, Britain, April 9, 2021. Philip's sharp wit and dedication to his duty earned him widespread popularity in Britain, but he was also criticised for off-the-cuff racist and sexist remarks. REUTERS/Henry Nicholls

A child brings flowers to Buckingham Palace after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in London, Britain, April 10, 2021. REUTERS/Henry Nicholls

A mourner stands outside Buckingham Palace after it was announced that Britain's Prince Philip, husband of Queen Elizabeth, has died at the age of 99, in London, Britain, April 9, 2021. REUTERS/Hannah McKay

Mourners gather outside Buckingham Palace after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in London, Britain, April 9, 2021. REUTERS/Hannah McKay