An employee of the farm in the disused World War Two bunker, where herbs and micro-greens are grown using hydroponic technology and LED lighting powered by renewable energy, is seen in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Herbs and micro-greens grown at the underground farm in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, are pictured in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

A sign shows the way to an underground farm that grows herbs and micro-greens in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee inspects herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An underground farm located in a disused World War Two bunker, that grows herbs and micro-greens using hydroponic technology and LED lighting powered by renewable energy, is pictured in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee inspects a tray of herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Zero Carbon Farm's business development director Olivia O'Brien inspects herbs and micro-greens that grow at a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee transports trays at a farm in a disused World War Two bunker that uses hydroponic technology and LED lighting powered by renewable energy to grow herbs and micro-greens, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Employees prepare trays of herbs and micro-greens, grown at a farm in a disused World War Two bunker using hydroponic technology and LED lighting powered by renewable energy, for deliveries in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee harvests herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Buckets with seeds ready for planting are pictured at a farm in a disused World War Two bunker that uses hydroponic technology and LED lighting powered by renewable energy to grow herbs and micro-greens, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An irrigation system used to grow herbs and micro-greens at a farm in a disused World War Two bunker, that uses 70 per cent less water, is seen in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

The farm's head grower Tommaso Vermeir inspects seeds ready to plant in a disused World War Two bunker that uses hydroponic technology and LED lighting powered by renewable energy to grow herbs and micro-greens in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Herbs and micro-greens grown at the underground farm in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, are pictured, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

The farm's head grower Tommaso Vermeir inspects seeds ready to plant in a disused World War Two bunker that uses hydroponic technology and LED lighting powered by renewable energy to grow herbs and micro-greens in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An irrigation system used to grow herbs and micro-greens at a farm in a disused World War Two bunker, that uses 70 per cent less water, is pictured in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee transports trays of herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An underground farm that grows herbs and micro-greens in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, is pictured in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An underground farm that grows herbs and micro-greens in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, is pictured in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An underground farm that grows herbs and micro-greens in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, is pictured in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Herbs and micro-greens grown at the underground farm in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, are pictured, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Zero Carbon Farm's business development director Olivia O'Brien inspects herbs and micro-greens that grow at a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee transports trays of herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An underground farm, that grows herbs and micro-greens in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, is pictured in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Zero Carbon Farm's business development director Olivia O'Brien inspects herbs and micro-greens that grow at a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Zero Carbon Farm's business development director Olivia O'Brien poses for a portrait at a disused World War Two bunker that uses hydroponic technology and LED lighting, powered by renewable energy, to grow herbs and micro-greens in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee holds a tray of herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Zero Carbon Farm's business development director Olivia O'Brien poses for a portrait at a disused World War Two bunker that uses hydroponic technology and LED lighting, powered by renewable energy, to grow herbs and micro-greens in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

The farm's head grower Tommaso Vermeir inspects a tray of herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee holds a tray of herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Zero Carbon Farm's business development director Olivia O'Brien poses for a portrait at a disused World War Two bunker that uses hydroponic technology and LED lighting, powered by renewable energy, to grow herbs and micro-greens in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

The farm's head grower Tommaso Vermeir inspects a tray of herbs and micro-greens grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

The farm's head grower Tommaso Vermeir inspects a tray of herbs and micro-greens grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee harvests herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

An employee transports trays of herbs and micro-greens that are grown in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, in London, Britain November 24, 2022. REUTERS/Maja Smiejkowska 

Healthcare workers treat a wounded Ukrainian serviceman in a pre-hospital medical aid centre, as Russia's attack on Ukraine continues, in Donetsk region, Ukraine November 17, 2022. REUTERS/Anna Kudriavtseva TPX IMAGES OF THE DAY 

Former Prime Minister Liz Truss attends the Remembrance Sunday ceremony at the Cenotaph on Whitehall in central London, on November 13, 2022. - Remembrance Sunday is an annual commemoration held on the closest Sunday to Armistice Day, November 11, the anniversary of the end of the First World War and services across Commonwealth countries remember servicemen and women who have fallen in the line of duty since WWI. (Photo by ISABEL INFANTES / POOL / AFP) /Pool via REUTERS 

Britain's Home Secretary Suella Braverman (L) and Britain's Foreign Secretary James Cleverly (R) lay wreaths during the Remembrance Sunday ceremony at the Cenotaph on Whitehall in central London, on November 13, 2022. - Remembrance Sunday is an annual commemoration held on the closest Sunday to Armistice Day, November 11, the anniversary of the end of the First World War and services across Commonwealth countries remember servicemen and women who have fallen in the line of duty since WWI. (Photo by ISABEL INFANTES / POOL / AFP) /Pool via REUTERS 

Former Prime Ministers, Boris Johnson (C) and Liz Truss (2nd L) attend the Remembrance Sunday ceremony at the Cenotaph on Whitehall in central London, on November 13, 2022. - Remembrance Sunday is an annual commemoration held on the closest Sunday to Armistice Day, November 11, the anniversary of the end of the First World War and services across Commonwealth countries remember servicemen and women who have fallen in the line of duty since WWI. (Photo by ISABEL INFANTES / POOL / AFP) /Pool via REUTERS 

Britain's Home Secretary Suella Braverman (L) and Britain's Foreign Secretary James Cleverly (R) lay wreaths during the Remembrance Sunday ceremony at the Cenotaph on Whitehall in central London, on November 13, 2022. - Remembrance Sunday is an annual commemoration held on the closest Sunday to Armistice Day, November 11, the anniversary of the end of the First World War and services across Commonwealth countries remember servicemen and women who have fallen in the line of duty since WWI. (Photo by ISABEL INFANTES / POOL / AFP) /Pool via REUTERS 

Former Prime Ministers, (L-R) Tony Blair, David Cameron, Boris Johnson, John Major and Gordon Brown attend the Remembrance Sunday ceremony at the Cenotaph on Whitehall in central London, on November 13, 2022. - Remembrance Sunday is an annual commemoration held on the closest Sunday to Armistice Day, November 11, the anniversary of the end of the First World War and services across Commonwealth countries remember servicemen and women who have fallen in the line of duty since WWI. (Photo by ISABEL INFANTES / POOL / AFP) /Pool via REUTERS 

A message from Britain's King Charles is seen on a wreath placed during the Remembrance Sunday ceremony at The Cenotaph War Memorial on Whitehall in London, Britain, November 13, 2022. REUTERS/Henry Nicholls 

People view the wreaths placed during the Remembrance Sunday ceremony at The Cenotaph War Memorial on Whitehall in London, Britain, November 13, 2022. REUTERS/Henry Nicholls 

People view the wreaths placed during the Remembrance Sunday ceremony at The Cenotaph War Memorial on Whitehall in London, Britain, November 13, 2022. REUTERS/Henry Nicholls 

People view the wreaths placed during the Remembrance Sunday ceremony at The Cenotaph War Memorial on Whitehall in London, Britain, November 13, 2022. REUTERS/Henry Nicholls 

A message from British Prime Minister Rishi Sunak is seen on a wreath placed during the Remembrance Sunday ceremony at The Cenotaph War Memorial on Whitehall in London, Britain, November 13, 2022. REUTERS/Henry Nicholls 

People view the wreaths placed during the Remembrance Sunday ceremony at The Cenotaph War Memorial on Whitehall in London, Britain, November 13, 2022. REUTERS/Henry Nicholls 

People view the wreaths placed during the Remembrance Sunday ceremony at The Cenotaph War Memorial on Whitehall in London, Britain, November 13, 2022. REUTERS/Henry Nicholls 

People view the wreaths placed during the Remembrance Sunday ceremony at The Cenotaph War Memorial on Whitehall in London, Britain, November 13, 2022. REUTERS/Henry Nicholls 

People view the wreaths placed during the Remembrance Sunday ceremony at the Cenotaph war memorial on Whitehall in London, Britain, November 13, 2022. REUTERS/Henry Nicholls 

A child watches a life-size statue of Russian President Vladimir Putin sitting on a tiny tank by French street artist James Colomina in Regents Park in London, Britain November 12, 2022. The artist stages impromptu unauthorized shows and has previously deployed Putin in New York, Paris, and Barcelona. REUTERS/Yann Tessier 

A view of a life-size statue of Russian President Vladimir Putin sitting on a tiny tank by French street artist James Colomina in Regents Park in London, Britain November 12, 2022. The artist stages impromptu unauthorized shows and has previously deployed Putin in New York, Paris, and Barcelona. REUTERS/Yann Tessier 

People watch a life-size statue of Russian President Vladimir Putin sitting on a tiny tank by French street artist James Colomina in Regents Park in London, Britain November 12, 2022. The artist stages impromptu unauthorized shows and has previously deployed Putin in New York, Paris, and Barcelona. REUTERS/Yann Tessier 

A child watches a life-size statue of Russian President Vladimir Putin sitting on a tiny tank by French street artist James Colomina in Regents Park in London, Britain November 12, 2022. The artist stages impromptu unauthorized shows and has previously deployed Putin in New York, Paris, and Barcelona. REUTERS/Yann Tessier 

Tyrone Scott, from War on Want, participates in a protest calling for insurers to rule out East African Crude Oil Pipeline (EACOP) as part of a global day of action, in London, Britain, November 12, 2022. REUTERS/May James 

Tyrone Scott, from War on Want, participates in a protest calling for insurers to rule out East African Crude Oil Pipeline (EACOP) as part of a global day of action, in London, Britain, November 12, 2022. REUTERS/May James 

A poppy is seen on the the statue of soldier 'Tommy', a war statue by artist Ray Lonsdale, is seen during sunrise on Remembrance Day in Seaham, Britain, November 11, 2022. REUTERS/Lee Smith 

The statue of soldier 'Tommy', a war statue by artist Ray Lonsdale, is seen during sunrise on Remembrance Day in Seaham, Britain, November 11, 2022. REUTERS/Lee Smith 

The statue of soldier 'Tommy', a war statue by artist Ray Lonsdale, is seen during sunrise on Remembrance Day in Seaham, Britain, November 11, 2022. REUTERS/Lee Smith 

The statue of soldier 'Tommy', a war statue by artist Ray Lonsdale, is seen during sunrise on Remembrance Day in Seaham, Britain, November 11, 2022. REUTERS/Lee Smith