Puzzlebrains

I've just bought the Ordnance Survey Puzzle Book and I'm wondering if anyone else has tried it? I'm trying to decide whether to keep it or to give it as a birthday present for someone!

Also, I don't know how I missed this BUT I've only just realised there is a second GCHQ puzzle book (came out years ago!) Has anyone got it, and is it any good? Or just all impossibly difficult?

Talking of the first GCHQ puzzle book. I seem to have acquired two copies (given by two different people!) so if anyone would like one please say!

I got Ordnance Survey puzzles book a few years ago and was very disappointed with it. It didn't seem to be a puzzle book at all, but more "count the number of times the letter b appears on this map" type stuff.