Hi Loz,
There is a company here in New Zealand that will build you a full size radial WW1 replica if you want one! The guy has figured out how to put electric start on it too. Mind you it will cost you a bit more than 300 quid!
As to what the one you are looking at.... Well no real idea but you do get a aircraft to go with it. Sounds like you might have to go have another look & see if you can get a close up & some idea of what the engine might be, it could be one of those that Jo has piling up in here lounge....eerrrr cast storage area.
Cheers Kerrin