I had EXACTLY the same problem, but mine was due to the fact that I did not add up my times correctly as per the written instructions at the start of the logbook. So I went to the IAA, and told them I wished to write up a new one and could they stamp/sign it to make it official. They said no problem, to write on the old log book, Volume 1 and the new one Volume 2, but that I had to keep the first log book for my/their records as it is the one with all the official stamps, instructor's counter signatures, PPL examiner signature etc.
My old log book is an embarassment so I know exactly how you feel.