As to the fuel, I did take the engine in question in, and am since armed with vast knowledge from many great forums such as this, but seeing as that was the only member of staff, and the owner, and they sell the model of engine in question fitted to built models, surely someone going in there to pay £100s for the model would expect at least they might know what fuel it took.
After all we all started somewhere.
And if we can sort a suitable day out my stuff is near Selby, so not a long ride out, I am sure in the various bundles I have bought from retiring racers there will be something, I have 1/64 right through to 1/5 and all inbetween

I reckon tmaxx ones would be about right 115mm or so.