There is one dealing with collecting coins from your change and it may help you. It is aptly called 'Check Your Change' and it has a wealth of information on Decimal coins. It is quite cheap and can be found quite easily. As a new collector myself who collects Commemorative £2 and 50p's, I have recently purchased the book and I can highly recommend it. Chris Perkins the site owner publish book under the Rotographic banner.It can be purchased from this site,Ebay and Amazon and it is £6.30 I belive amust for modern coin collectors