Thanks a lot everyone. As I am getting (I hope) a Mamod SP4 for my birthday, which manufacturer doesn't really come in to question (at the moment). However, I might well get some of the Wilesco Drive Models to go with it. Fairly expensive for what they are but I don't quite see the point in having a stationary steam engine without having something to run it with. Another question about Sterno Gel, is it worth a try?
Cheers
Brian