The grim scene is 200 yards along a farm track just half a mile from the Sandringham Stud, where the Queen breeds racehorses.
Mrs Rhodes also tells a story of how she was out riding with the Queen at Sandringham at the height of the Irish Troubles.
Built to exactly half the scale of a regular Aston Martin, it is now on display at the royal museum at Sandringham.
The trip to Sandringham folows a new preparedness of the couple to be seen together.
The Middletons usually go to Mustique in December, but Kate had to be at Sandringham for Christmas, so the trip was delayed.
The bowling-alley at Sandringham was one of the best in England and the Prince was always fond of a game of bowls.
"Yes; this is Sandringham," said the girl, with a sort of shamefaced humour.
At Sandringham they have great droves of pigeons, which the entire family love and care for.
I admit it then: I have no respect for Captain Sandringham—none whatever.
The raiders then flew to Sandringham and King's Lynn, at both of which places bombs were dropped.