American whistleblower Edward Snowden appears remotely during the 'The Belmarsh Tribunal', which is calling for the release of Wikileaks founder Julian Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

Stella Maris, partner to Wikileaks founder Julian Assange, speaks during the 'The Belmarsh Tribunal', which is calling for the release of Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

Stella Maris, partner to Wikileaks founder Julian Assange, speaks during the 'The Belmarsh Tribunal', which is calling for the release of Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

American whistleblower Edward Snowden appears remotely during the 'The Belmarsh Tribunal', which is calling for the release of Wikileaks founder Julian Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

American whistleblower Edward Snowden appears remotely during the 'The Belmarsh Tribunal', which is calling for the release of Wikileaks founder Julian Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

Stella Maris, partner to Wikileaks founder Julian Assange, speaks during the 'The Belmarsh Tribunal', which is calling for the release of Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

American whistleblower Edward Snowden appears remotely during the 'The Belmarsh Tribunal', which is calling for the release of Wikileaks founder Julian Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

American whistleblower Edward Snowden appears remotely during the 'The Belmarsh Tribunal', which is calling for the release of Wikileaks founder Julian Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

Journalist Ewen MacAskill speaks during the 'The Belmarsh Tribunal', which is calling for the release of Wikileaks founder Julian Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

Former Labour Party leader Jeremy Corbyn speaks during the 'The Belmarsh Tribunal', which is calling for the release of Wikileaks founder Julian Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

British Labour politician John McDonnell attends the 'The Belmarsh Tribunal', which is calling for the release of Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

Media film during the 'The Belmarsh Tribunal', which is calling for the release of Wikileaks founder Julian Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

Media film during the 'The Belmarsh Tribunal', which is calling for the release of Wikileaks founder Julian Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

Stella Morris, partner of Wikileaks founder Julian Assange, sits next to former Labour Party leader Jeremy Corbyn as he speaks during the 'The Belmarsh Tribunal', which is calling for the release of Assange from prison, in London, Britain, October 22, 2021. REUTERS/Henry Nicholls

A person walks past the Bank of England in London, Britain, October 22, 2021. REUTERS/Tom Nicholson

People walk past the Bank of England in London, Britain, October 22, 2021. REUTERS/Tom Nicholson

Britain's Prime Minister Boris Johnson speaks to the media as he visits at a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

A person walks past the Bank of England in London, Britain, October 22, 2021. REUTERS/Tom Nicholson

Britain's Prime Minister Boris Johnson shakes a dose of the Pfizer's coronavirus disease (COVID-19) vaccine as it is diluted before being administered during his visit at a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson greets 88-year-old Nitza Sarner while she waits to receive a pfizer booster vaccination as he visits at a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson watches as staff dilutes a dose of the pfizer vaccine before administering it as he visits at a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

A person walks past the Bank of England in London, Britain, October 22, 2021. REUTERS/Tom Nicholson

A person walks past the Bank of England in London, Britain, October 22, 2021. REUTERS/Tom Nicholson

A person walks past the Bank of England in London, Britain, October 22, 2021. REUTERS/Tom Nicholson

General view of the Bank of England in London, Britain, October 22, 2021. REUTERS/Tom Nicholson

A person walks past the Bank of England in London, Britain, October 22, 2021. REUTERS/Tom Nicholson

Britain's Prime Minister Boris Johnson shakes a dose of the Pfizer's coronavirus disease (COVID-19) vaccine as it is diluted before being administered during his visit at a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson shakes a dose of the Pfizer's coronavirus disease (COVID-19) vaccine as it is diluted before being administered during his visit at a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson shakes a dose of the Pfizer's coronavirus disease (COVID-19) vaccine as it is diluted before being administered during his visit at a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson greets a boy as he visits a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks with people as he visits a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson greets people as he visits a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks with people as he visits a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

A person points to the City of London financial district from a viewing platform in London, Britain, October 22, 2021. REUTERS/Hannah McKay

A woman looks out to the City of London financial district from a viewing platform in London, Britain, October 22, 2021. REUTERS/Hannah McKay

The City of London financial district is seen in London, Britain, October 22, 2021. REUTERS/Hannah McKay

The City of London financial district is seen in London, Britain, October 22, 2021. REUTERS/Hannah McKay

People look out to the City of London financial district from a viewing platform in London, Britain, October 22, 2021. REUTERS/Hannah McKay

A man looks out to the City of London financial district from a viewing platform in London, Britain, October 22, 2021. REUTERS/Hannah McKay

The City of London financial district is seen from a viewing platform in London, Britain, October 22, 2021. REUTERS/Hannah McKay

Britain's Prime Minister Boris Johnson greets staff as he visits a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson greets people as he visits a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks with people as he visits a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Britain's Prime Minister Boris Johnson visits a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

A child plays with a piano as people pick pumpkins at The Pop Up Farm ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge TPX IMAGES OF THE DAY

Britain's Prime Minister Boris Johnson shakes a dose of the Pfizer's coronavirus disease (COVID-19) vaccine as it is diluted before being administered during his visit at a COVID-19 vaccination centre at Little Venice Sports Centre, in London, Britain October 22, 2021. Matt Dunham/Pool via REUTERS

Rachel Britton and her daughter Esmae, 3, pick pumpkins and squashes at The Pop Up Farm ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Pumpkins are seen at The Pop Up Farm as people pick pumpkins ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Arlo, 2, sits in a wheelbarrow as people pick pumpkins and squashes The Pop Up Farm ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Laura Yan and her son Arlo, 2, pick pumpkins and squashes at The Pop Up Farm ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

People taking a seflie picture as they pick pumpkins at The Pop Up Farm ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Laura Yan and her son Arlo, 2, pick pumpkins and squashes at The Pop Up Farm ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Ian and Gillian Pigott from The Pop Up Farm pose with pumpkins ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Rachel Britton pushes a wheelbarrow as she picks pumpkins and squashes at The Pop Up Farm ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Laura Yan and her son Arlo, 2, pick pumpkins and squashes at The Pop Up Farm ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Pumpkins are seen at The Pop Up Farm as people pick pumpkins ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Pumpkins are seen at The Pop Up Farm as people pick pumpkins ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Ian and Gillian Pigott from The Pop Up Farm pose with pumpkins ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

A woman takes a picture while a child plays a piano amongst pumpkins at The Pop Up Farm ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge

Pumpkins are seen at The Pop Up Farm as people pick pumpkins ahead of Halloween, in Flamstead, St Albans, Britain, October 22, 2021. REUTERS/Andrew Couldridge