Ive got a book with mis-printings, pages upside down etc. Is it valuable?
No, probably not. Ladybird Books from the 1960s onwards were printed on tight timescales and in such vast numbers that mistakes were very common. There are many of these mis-printed books around and they have no value. However, some older (pre 1960s) books had mis-prints which might be of interest to a collector. For example, there is an unfortunate misprint in the first edition of What to Look for in Winter, which marks the book out as a first edition and therefore adds value. I’ve known a collector or two who collect copies with Erratum stickers and early mistakes of this kind.