Probably a useless post but i'll put it up in case anyone else here knows the name of the book, I don't have a copy of it and I cannot remember the name of it.....
Autobiography written by an RAF test pilot, from his time starting in late WW2 through to the early 80's I think it was.
Fascinating reading, especially regarding being sent into Germany just after the war ended and test flying all the Luftwaffe jets and secret developmental aircraft.