Thousands of nurses are staging a second walkout in a row over pay as a series of strikes hits the UK in the run-up to Christmas.
Around a quarter of hospitals and community teams in England are taking part in the strike, alongside all trusts in Northern Ireland and all but one health board in Wales.
The Royal College of Nursing (RCN) and the government are locked in a bitter dispute over pay, with ministers saying the salary rise demanded by unions is unaffordable.
On Wednesday, ambulance workers including paramedics, control room workers and technicians will also walk out in England and Wales, with health chiefs warning this represents the most serious threat to date.
The RCN has been calling for a pay rise of 5% above inflation, though it has indicated it would accept a lower offer.
When it submitted the 5% figure to the independent pay review body in March, inflation was running at 7.5%.
But inflation has since soared, with RPI standing at 14.2% in September.
The government has implemented the recommendations of the independent pay review body, which gave nurses a rise of about 4.75%, with a guaranteed minimum of £1,400.
During Tuesday’s strike, the NHS will be running a bank holiday-style service in many areas as thousands of operations and procedures are cancelled and rescheduled.
The RCN has said it will still staff chemotherapy, emergency cancer services, dialysis, critical care units, neonatal and paediatric intensive care, as well as some other services.
Speaking ahead of the strike, RCN chief executive Pat Cullen said: “The prime minister should ask himself what is motivating nursing staff to stand outside their hospitals for a second day so close to Christmas.
“They are prepared to sacrifice a day’s pay to have their concerns heard. Their determination stems as much from worries over patient safety and the future of the NHS than personal hardship.
“Rishi Sunak is under growing pressure in Westminster following last Thursday’s strike and he should listen to people around him.
“The public is increasingly with their local nursing staff and this government desperately needs to get on the right side of them. It is unprecedented for my members to strike.
“Let’s get this wrapped up by Christmas. I will negotiate with him at any point to stop nursing staff and patients going into the new year facing such uncertainty.
The Government, for its part, is being responsible in putting in place contingency measures to make sure we are well prepared to handle the disruption that is coming
“But if this government isn’t prepared to do the right thing, we’ll have no choice but to continue in January and that will be deeply regrettable.”
Health secretary Steve Barclay said: “The RCN’s demands are unaffordable during these challenging times and would take money away from frontline services while they are still recovering from the impact of the pandemic. I’m open to engaging with the unions on how to make the NHS a better place to work.”
Mr Barclay will meet unions representing striking ambulance drivers in 11th hour talks on Tuesday, although the discussions are unlikely to avert the action.
He wants to discuss patient safety with Unison, GMB and Unite but his refusal to negotiate on pay means the following day’s strikes are bound to go ahead.
The only reason we’re entrenched is because we’ve got no-one to talk to about what the issue is
We have planned with great care for this strike, but our services will be extremely busy and we do expect them to be severely disrupted
