It is a marked change of heart from the Duke’s original reaction to the crash, which saw him take delivery of a replacement Land Rover the day after the crash and drive it out on the roads around Sandringham without a seatbelt.
The accident, on January 17, saw the Duke pulled out of his car through the sunroof after it “tumbled” across the A149 and ended on its side.
The following day, he attended the Queen Elizabeth Hospital in King’s Lynn for closer examination, with palace aides saying he had “no injuries of concern” despite reports of him bleeding.
The Duke later wrote to the driver and passenger of the other car, telling Emma Fairweather, who broke her wrist: “I would like you to know how very sorry I am for my part in the accident at the Babingley cross-roads.
“I have been across that crossing any number of times and I know very well the amount of traffic that uses that main road.
“It was a bright sunny day and at about three in the afternoon, the sun was low over the Wash.
“In other words, the sun was shining low over the main road. In normal conditions I would have no difficulty in seeing traffic coming from the Dersingham direction, but I can only imagine that I failed to see the car coming, and I am very contrite about the consequences.