This is driving me mad!!! About 6 years ago, I used to buy a logic puzzle book every month and the puzzles were really tricky, which is why I liked them. It is definitely not Logic Problems by Puzzler. I used to buy it in WH Smith but haven't seen it for years now.
The book was about A5 in size and I *think it had a picture of a head on the front, but I might be wrong with this. Does anyone PLEASE know what this was called as I would love to find it again. Please put me out of my misery!