Some years ago, I came across a book of aircraft pictures in a charity shop. It had one picture to represent each year. As I was looking through it, I noticed that the picture for 1942, a Lancaster, had been autographed for (I presume) the books previous owner. I was fairly sure that I could tell who had written the autograph, although the signature wasn't the clearest, and so I bought it. A bit of checking confirmed my opinion that the signature was that of Leonard Cheshire.
A top find, I think you'll agree.