Thanks very much for all your help, folks. It looks like I'm going to have to use a bit of poetic licence, I'm having trouble matching the exact colours of my model with what is available to buy. However, it looks like White Ensign is my best bet so far. Drawing a blank at things like SAC Bomber Green.
--edit--
Ok, managed to get nearly all that I was looking for from White Ensign and a shop in Edinburgh: wonderlandmodels.com
Thanks for all your help folks. I'll keep an eye out for the other couple - if anyone knows where I can get my hands on some gloss red and SAC Bomber green, it would be much appreciated.