YAY! Just a little more work and a change of search and I found it!
http://www.pure-2-stroke-spirit.info/download/yamaha_model_codes.pdf
That's what i was after, but here's the link in case it's of any interest to anyone else!
Hi all
Just considering buying a new bike but i need to do a bit of homework as the bike was originally registered abroad. I know there is a list somewhere on the internet which will help identify the bikes origin (with the frame no etc) but does anyone know where I can find it? I've been looking everywhere for the d#*m thing!
Cheers