Wales TUC General Secretary Shav Taj is joined by her daughters on the picket line during teachers' strike, outside Cardiff High School, in Cardiff, Britain, February 1, 2023. REUTERS/Natasha Hirst 

Britain's Chancellor of the Exchequer Rishi Sunak, Frances O'Grady, General Secretary of the British Trades Union Congress (TUC) and Dame Carolyn Fairbairn are seen at Downing Street amid the coronavirus disease (COVID-19) outbreak in London, Britain September 24, 2020. REUTERS/John Sibley 

Iraqi demonstrators use tuc-tuc during ongoing anti-government protests in Baghdad, Iraq January 20, 2020. REUTERS/Thaier al-SudanI 

Iraqi demonstrators use tuc-tuc during ongoing anti-government protests in Baghdad, Iraq January 20, 2020. REUTERS/Thaier al-SudanI 

TUC General Secretary Frances O'Grady leaves Downing Street in London, Britain January 24, 2019. REUTERS/Toby Melville 

TUC General Secretary Frances O'Grady leaves Downing Street in London, Britain January 24, 2019. REUTERS/Toby Melville 

TUC General Secretary Frances O'Grady leaves Downing Street in London, Britain January 24, 2019. REUTERS/Toby Melville 

Britain's Labour Party leader Jeremy Corbyn addresses a rally, part of the TUC's ‘A New Deal for Working People’ campaign, in central London, Britain, May 12, 2018. REUTERS/Toby Melville 

Britain's Labour Party leader Jeremy Corbyn addresses a rally, part of the TUC's ‘A New Deal for Working People’ campaign, in central London, Britain, May 12, 2018. REUTERS/Toby Melville 

Britain's Labour Party leader Jeremy Corbyn addresses a rally, part of the TUC's ‘A New Deal for Working People’ campaign, in central London, Britain, May 12, 2018. REUTERS/Toby Melville 

Britain's Labour Party leader Jeremy Corbyn addresses a rally, part of the TUC's ‘A New Deal for Working People’ campaign, in central London, Britain, May 12, 2018. REUTERS/Toby Melville 

Britain's Labour Party leader Jeremy Corbyn addresses a rally, part of the TUC's ‘A New Deal for Working People’ campaign, in central London, Britain, May 12, 2018. REUTERS/Toby Melville 

Britain's Labour Party leader Jeremy Corbyn addresses a rally, part of the TUC's ‘A New Deal for Working People’ campaign, in central London, Britain, May 12, 2018. REUTERS/Toby Melville 

Britain's Labour Party leader Jeremy Corbyn addresses a rally, part of the TUC's ‘A New Deal for Working People’ campaign, in central London, Britain, May 12, 2018. REUTERS/Toby Melville 

Britain's Labour Party leader Jeremy Corbyn is greeted by TUC General Secretary Frances O'Grady before addressing a rally, part of the TUC's ‘A New Deal for Working People’ campaign, in central London, Britain, May 12, 2018. REUTERS/Toby Melville 

Demonstrators march in a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators prepare a banner head of a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators march in a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators march in a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators march in a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators, including TUC General Secretary Frances O'Grady, march in a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators march in a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators march in a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators march in a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators march in a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators gather for a public sector workers protest, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Demonstrators gather for a public sector workers demonstration, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Len McCluskey, General Secretary of Unite the Union, poses for a photograph ahead of a public sector workers demonstration, organised by the Trades Union Congress (TUC), as part of its ‘A New Deal for Working People’ campaign, in central London, Britain May 12, 2018. REUTERS/Toby Melville 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady is silhouetted against a screen as she speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady arrives before her speech during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady is silhouetted against a screen as she speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during their annual conference in Brighton, Britain September 12, 2016. REUTERS/Stefan Wermuth 

Boris Johnson and Mayor of London Sadiq Khan shake hands as Gisela Stuart and TUC General Secretary Frances O'Grady greet each other, after The Great Debate on BBC One, on the EU Referendum in London, Britain June 21, 2016. REUTERS/Stefan Rousseau/Pool 

Scottish Conservative leader Ruth Davidson, Mayor of London Sadiq Khan and TUC General Secretary Frances O'Grady react before The Great Debate on BBC One, on the EU Referendum in London, Britain June 21, 2016. REUTERS/Stefan Rousseau/Pool 

Boris Johnson, Gisela Stuart, Energy Minister Andrea Leadsom, David Dimbleby, Scottish Conservative leader Ruth Davidson, Mayor of London Sadiq Khan and TUC General Secretary Frances O'Grady participate in The Great Debate on BBC One, on the EU Referendum in London, Britain June 21, 2016. REUTERS/Stefan Rousseau/Pool 

Boris Johnson, Gisela Stuart, Energy Minister Andrea Leadsom, David Dimbleby, Scottish Conservative leader Ruth Davidson, Mayor of London Sadiq Khan and TUC General Secretary Frances O'Grady participate in The Great Debate on BBC One, on the EU Referendum in London, Britain June 21, 2016. REUTERS/Stefan Rousseau/Pool 

Scottish Conservative leader Ruth Davidson, Mayor of London Sadiq Khan and TUC General Secretary Frances O'Grady talk before The Great Debate on BBC One, on the EU Referendum in London, Britain June 21, 2016. REUTERS/Stefan Rousseau/Pool 

Scottish Conservative leader Ruth Davidson, Mayor of London Sadiq Khan and TUC General Secretary Frances O'Grady talk before The Great Debate on BBC One, on the EU Referendum in London, Britain June 21, 2016. REUTERS/Stefan Rousseau/Pool 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during the launch of a poster campaign urging voters to remain part of the European Union, in London, Britain, June 1, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during the launch of a poster campaign urging voters to remain part of the European Union, in London, Britain, June 1, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during the launch of a poster campaign urging voters to remain part of the European Union, in London, Britain, June 1, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during the launch of a poster campaign urging voters to remain part of the European Union, in London, Britain, June 1, 2016. REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady poses for a photograph before an interview with Reuters in London, Britain January 26, 2016. Britain's trade unions are close to joining the push to keep the country in the European Union, bringing grass-roots muscle to a fight that has so far been dominated by big business and bankers, the head of the country's largest union group said. Unions will fight to stay in, emphasising jobs and workers' rights, Frances O'Grady, general secretary of the Trades Union Congress, told Reuters in an interview.REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady gestures during an interview with Reuters in London, Britain January 26, 2016. Britain's trade unions are close to joining the push to keep the country in the European Union, bringing grass-roots muscle to a fight that has so far been dominated by big business and bankers, the head of the country's largest union group said. Unions will fight to stay in, emphasising jobs and workers' rights, Frances O'Grady, general secretary of the Trades Union Congress, told Reuters in an interview.REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady poses for a photograph before an interview with Reuters in London, Britain January 26, 2016. Britain's trade unions are close to joining the push to keep the country in the European Union, bringing grass-roots muscle to a fight that has so far been dominated by big business and bankers, the head of the country's largest union group said. Unions will fight to stay in, emphasising jobs and workers' rights, Frances O'Grady, general secretary of the Trades Union Congress, told Reuters in an interview. REUTERS/Stefan WermuthTPX IMAGES OF THE DAY 

Trades Union Congress (TUC) General Secretary Frances O'Grady poses for a photograph before an interview with Reuters in London, Britain January 26, 2016. Britain's trade unions are close to joining the push to keep the country in the European Union, bringing grass-roots muscle to a fight that has so far been dominated by big business and bankers, the head of the country's largest union group said. Unions will fight to stay in, emphasising jobs and workers' rights, Frances O'Grady, general secretary of the Trades Union Congress, told Reuters in an interview.REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during an interview with Reuters in London, Britain January 26, 2016. Britain's trade unions are close to joining the push to keep the country in the European Union, bringing grass-roots muscle to a fight that has so far been dominated by big business and bankers, the head of the country's largest union group said. Unions will fight to stay in, emphasising jobs and workers' rights, Frances O'Grady, general secretary of the Trades Union Congress, told Reuters in an interview.REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady poses for a photograph before an interview with Reuters in London, Britain January 26, 2016. Britain's trade unions are close to joining the push to keep the country in the European Union, bringing grass-roots muscle to a fight that has so far been dominated by big business and bankers, the head of the country's largest union group said. Unions will fight to stay in, emphasising jobs and workers' rights, Frances O'Grady, general secretary of the Trades Union Congress, told Reuters in an interview.REUTERS/Stefan Wermuth 

Trades Union Congress (TUC) General Secretary Frances O'Grady speaks during an interview with Reuters in London, Britain January 26, 2016. Britain's trade unions are close to joining the push to keep the country in the European Union, bringing grass-roots muscle to a fight that has so far been dominated by big business and bankers, the head of the country's largest union group said. Unions will fight to stay in, emphasising jobs and workers' rights, Frances O'Grady, general secretary of the Trades Union Congress, told Reuters in an interview.REUTERS/Stefan Wermuth 

The new leader of Britain's opposition Labour Party Jeremy Corbyn waves as he aknowledges applause before addressing the Trade Union Congress (TUC) in Brighton in southern England, September 15, 2015. REUTERS/Peter Nicholls