I put in a few of my books just for fun to see what Amazon were offering. Most were 25p!

The best I could do - apart from the £30 one - was 'The Triple Tree' for £3.20p. The only other book I own that I know is of interest to some collectors is a first edition of 'The Book of Bond or Every Man His Own 007'. I've seen that for sale for around £65. Amazon tells me it's worth £1.26p trade-in!

Many thanks for your replies - most interesting...