A few posts down from this Rodger Cockburn speaks about the Haynes Enthusiasts' Manual for the RouteMaster Bus (1954 and onwards). I purchased the kit from Hannants a few weeks ago. I took Rodger's advice and ordered a copy from Amazon.com for $29.95 plus tax (shipping was free). It came today and what a great resource for the doubledecker bus! Lots of good color pictures to inspire you to paint your kit with. 149 pages of text and pictures, plus 15 pages of Appendix's. The book is hard bound.
If you're looking for some resource material you should think hard about picking up a copy! Now if we can only find some aftermarket decals!
It was very helpful of the chap doing a build on another site to mention it as I didn't realize there was a Haynes manual.
I was interested to see the first Routemaster entered service with a different front cover to the radiator and lights. I'm glad they changed it!