A widow of 83 was 'serious by stable' in hospital on Tuesday after she was knocked down by a police motorbike escorting William and Kate.

Witnesses said the bike was on the wrong side of the road clearing traffic when it hit Irene Mayor in East Sheen, West London. William and Kate have sent flowers to the elderly widow — and hope to visit her in hospital to apologise.

Irene Mayor, 83, was thrown into the air by the impact and landed awkwardly. She was taken to hospital by air ambulance and was on Tuesday night serious but stable with a broken pelvis and other injuries. The bike that hit Irene was a police outrider clearing traffic in front of the couple’s motorcade as it headed to Windsor for a Knights of the Garter ceremony.

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A witness said: “His bike hit her and she spun round, off her feet and fell badly on the floor." “The officer was devastated. But he was going on the wrong side of the road. It could have been so much worse.”

It is understood the Duke and Duchess of Cambridge were also “devastated” when told of the crash. They did not learn of it until after arriving at Windsor. They sent flowers to Mrs. Mayor on Tuesday with a handwritten note expressing their sorrow. They have told her daughter Fiona they would like to visit her if she feels up to it.

Fiona, who lives with her mum 300 yards from the accident scene in East Sheen, West London, said: “She’s got lots of injuries. They are just keeping her stable at the moment.”

A member of Kate and William’s staff visited Fiona on Tuesday. The Royal couple were in a Range Rover with at least four motorcycle outriders and two other cars as they headed to Windsor on Monday afternoon.

Photos from the aftermath of the crash show a police bike on its side pointing in the opposite direction to the traffic. Locals said the officer was driving down the wrong side of the road with flashing lights when Irene stepped out as she headed for home.

Lionel Blackburn, 78, a friend of Irene’s said: “She’s an incredibly nice person." “I have known her for over 40 years. She used to do a lot of voluntary work for the church and her husband Walter used to lead the evening service.

“We were all devastated when we heard she had been hit by the police bike," he said. “Irene is always smiling and cheerful, hopefully she’ll be back at church soon.”

Another friend said: “She’s a lovely lady, we are all very worried about her.”

The accident will be investigated by the Independent Office for Police Conduct. It is standard police procedure for Royal or diplomatic convoys to continue if there is an incident involving an outrider.

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This report was originally published by The Sun.