Goodness, that's a bit pricey! I borrowed mine from my uncle!
I have read all the others in the series and found them really amusing, I don't think I'd pay £20 though! If you can borrow a copy, I think you'd enjoy it though!
(Thought I'd better clarify, although I do hope you didn't think this, that I didn't write it or anything! Nor do I have shares in Simon Brett!)