Mayor of London Sadiq Khan walks by the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

People embrace each other by the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

A health worker from St Thomas' hospital stands behind a wall being painted in hearts as a memorial to all those who have died so far in the UK from COVID-19, amid the spread of the coronavirus disease pandemic in London, Britain, March 29, 2021.

General view of a plaque of the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

People stand by the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

Volunteers and relatives of bereaved paint hearts along a wall beside St Thomas' hospital as a memorial to all those who have died so far in the UK from COVID-19, amid the spread of the coronavirus disease pandemic in London, Britain, March 29, 2021.

A person walks past the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

A man runs past a wall of hearts being painted by volunteers and relatives of bereaved beside St Thomas' hospital as a memorial to all those who have died so far in the UK from COVID-19, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, April 1, 2021.

A woman holds a book by the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

Mayor of London Sadiq Khan walks by the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

A hand touches a wall as volunteers and relatives of bereaved paint hearts along a wall beside St Thomas' hospital as a memorial to all those who have died so far in the UK from COVID-19, amid the spread of the coronavirus disease pandemic in London, Britain, March 29, 2021.

Volunteers and relatives of bereaved paint hearts along a wall beside St Thomas' hospital as a memorial to all those who have died so far in the UK from COVID-19, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, April 1, 2021.

Mayor of London Sadiq Khan looks on by the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

A flower is seen mounted amongst painted hearts on the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

Volunteers and relatives of bereaved paint hearts along a wall beside St Thomas' hospital as a memorial to all those who have died so far in the UK from COVID-19, amid the spread of the coronavirus disease pandemic in London, Britain, March 29, 2021.

Volunteers and relatives of bereaved paint hearts along a wall beside St Thomas' hospital as a memorial to all those who have died so far in the UK from COVID-19, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, April 1, 2021.

Mayor of London Sadiq Khan walks by the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

A woman walks past the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

A person paints on the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

Volunteers and relatives of bereaved paint hearts along a wall beside St Thomas' hospital as a memorial to all those who have died so far in the UK from COVID-19, amid the spread of the coronavirus disease pandemic in London, Britain, March 29, 2021.

A woman paints on the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

Volunteers and relatives of bereaved paint hearts along a wall beside St Thomas' hospital as a memorial to all those who have died so far in the UK from COVID-19, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, April 1, 2021.

A bird flies past the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

A woman wearing a face mask with a heart on it looks on by the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

A man writes on the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

Mayor of London Sadiq Khan walks by the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.

People walk past the National Covid Memorial wall beside St Thomas' hospital set as a memorial to all those who have died so far in the UK from the coronavirus disease (COVID-19), amid the coronavirus pandemic in London, Britain April 8, 2021.