I first read the story in a Telegraph colour magazine. I am fairly certain it was published 1 April 1968. A faily auspisious date! Point is it also included other "fatastic" stories, all with contempory photos of the principle chacters: Alkelmade; the WAAF who flew on a spitfire tail; the airman who evaded capture by stealing a bike "People stared a bit at the RAF blue as I rode past";and the tail gunner of a Halifax who spiraled safely to earth in the tail section when it broke off. I think I still have it, but at my parents house in a box so I won't be able to get hold of it straight away! As I recall the story was that Alkelmade was in danger of being shot as a spy because the Germans did not believe him until the burnt remains of his parachute were found in the wreckage of his aircraft. He attributed his survival to landing on young fir trees and soft snow.
As an aside I witnessed a "miraculous" survival at Shobdon in the early 80s. The Leader of the Irish Free Fall Team (Honest!) got into dificulty when his main, square, canopy failed to open. He deployed his reserve at what looked like 1000'. This just tangled around the main and he continued earthwards at a rather alarming rate. He fell silently no audible shout or scream. He fell behind the hangar and no one moved at first. Then a couple of parachute club members went to pick up the pieces. One of them ran back much faster than he had gone shouting "He's not dead!" Indeed he wasn't. Later on it was felt that he survived because the tangled canopies had caught a litle air just before he hit, I certainly think I saw that happen, and he hit a steep bank. So his decelleration was not as fast as if he had his flat concrete. He broke both legs and an arm and one or two other bones but did jump again.