People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

A man holds a placard as people protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

A woman holds a placard as people protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

A man holds a placard as people protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

Ambulances are parked in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

A woman holds a placard as people protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People protest in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People hold placards in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People hold placards in front of the London Ambulance Service during a strike by ambulance workers due to a dispute with the government over pay, in London, Britain January 23, 2023. REUTERS/Henry Nicholls 

People take part in a strike by ambulance workers due to a dispute with the government over pay, outside Royal Liverpool University Hospital in Liverpool, Britain January 23, 2023. REUTERS/Phil Noble 

Ambulance staff stand outside the Royal Liverpool University Hospital during a protest of ambulance workers due to a dispute with the government over pay, in Liverpool, Britain January 23, 2023. REUTERS/Phil Noble 

Ambulance staff stand outside the Royal Liverpool University Hospital during a protest of ambulance workers due to a dispute with the government over pay, in Liverpool, Britain January 23, 2023. REUTERS/Phil Noble 

People take part in a strike by ambulance workers due to a dispute with the government over pay, outside Royal Liverpool University Hospital in Liverpool, Britain January 23, 2023. REUTERS/Phil Noble TPX IMAGES OF THE DAY 

A woman holds a sign during a strike by ambulance workers due to a dispute with the government over pay, outside Royal Liverpool University Hospital in Liverpool, Britain January 23, 2023. REUTERS/Phil Noble 

People take part in a strike by ambulance workers due to a dispute with the government over pay, outside Aintree University Hospital in Liverpool, Britain January 23, 2023. REUTERS/Phil Noble 

People take part in a strike by ambulance workers due to a dispute with the government over pay, outside Aintree University Hospital in Liverpool, Britain January 23, 2023. REUTERS/Phil Noble 

Protestors hold signs during a strike by ambulance workers due to a dispute with the government over pay, outside Aintree University Hospital in Liverpool, Britain January 23, 2023. REUTERS/Phil Noble 

People hold placards during a strike by NHS nurses and other medical workers, amid a dispute with the government over pay, in London, Britain, January 18, 2023. REUTERS/Toby Melville 

People hold placards during a strike by NHS nurses and other medical workers, amid a dispute with the government over pay, in Downing Street, London, Britain, January 18, 2023. REUTERS/Toby Melville 

People carry a banner during a strike by NHS nurses and other medical workers, amid a dispute with the government over pay, in London, Britain, January 18, 2023. REUTERS/Toby Melville 

People hold placards during a strike by NHS nurses and other medical workers, amid a dispute with the government over pay, in London, Britain, January 18, 2023. REUTERS/Toby Melville 

A man holds a placard during a strike by NHS nurses and other medical workers, amid a dispute with the government over pay, in Downing Street, London, Britain, January 18, 2023. REUTERS/Toby Melville 

A woman holds a placard during a strike by NHS nurses and other medical workers, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses and other medical workers hold placards during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville TPX IMAGES OF THE DAY 

NHS nurses and other medical workers hold placards during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

A woman holds a placard during a strike by NHS nurses and other medical workers, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses and other medical workers hold placards during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

People holds placards as NHS nurses and other medical workers march during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

A woman holds a placard as NHS nurses march during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

A NHS nurse holds a banner during a strike, amid a dispute with the government over pay, outside the University College Hospital in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, outside the University College Hospital in London, Britain January 18, 2023. REUTERS/Toby Melville 

A NHS nurse holds a banner during a strike, amid a dispute with the government over pay, outside the University College Hospital in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, outside the University College Hospital in London, Britain January 18, 2023. REUTERS/Toby Melville 

A NHS nurse holds a banner during a strike, amid a dispute with the government over pay, outside the University College Hospital in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville 

NHS nurses hold banners during a strike, amid a dispute with the government over pay, in London, Britain January 18, 2023. REUTERS/Toby Melville TPX IMAGES OF THE DAY 

Ambulance workers keep a fire going to keep warm outside their Waterloo station, amid a strike due to a dispute with the government over pay, in London, Britain January 11, 2023. REUTERS/Toby Melville