What book are we reading at the moment?

I first read that book about 30 years ago and remember thoroughly enjoying it.
Husband is still hanging on to his mothers copy from 1973, signed by Mr Niven himself.

 

I was once flicking through a book of aircraft pictures in Oxfam, when I noticed that one of the pictures had been autographed. As with many "regular signers", it wasn't fully legible, but I had a good idea who it was likely to be and so I bought it on spec.

I was later able to find a specimen of the suspect's signature online and that, with the fact that it was a Lancaster picture that was signed, confirmed that it was, indeed, Leonard Cheshire.