Thank you very much for your prompt reply, I'll post some pictures of the buses to help you identify them.
For info An RT was The Standard 1940s/1960s AEC double decker and an RTL was the Leyland engined version, (only visible difference is a Leyland style radiator rather than an an AEC one).
On second thoughts, probably the RF is a little out of period for what I'm doing so an AEC merlin would be more in keeping, if at all possible please.
Whatever you can achieve will be great as no one does any LT buses in 'T'.
Many thanks Doug, I'll look forward to seeing some results whenever you get time to 'play', Hope these pics are of some use.
Best regards, Noel.
Knowledge is of no value unless it is shared, if you can remember it !!