The owner inherited the establishment from his father who spent many years touring scrap yards collecting an impressive hoard of items. Apparently this particular item was acquired in the mid eighties in very good working order from – he thinks – the chap that built it. He also reckons at it having been put together in the late seventies to early eighties just as a fun project, although the engine is quite probably older than that. So I wouldn't call it an antique either, more of a curio. It was apparently in good working order until it just ended up not being used for the last 20 years.
Although there is a light coating of surface rust over much of it there is nothing worse than that anywhere that I could see so might get lucky with the boiler but I certainly wouldn't risk not testing first. There are a couple or three boilers knocking around this place as well as other steam related bits.
I was also wondering about road legalities so that's handy to know, I fully intend to drive it to my local but I don't think I'll be drinking too much when I do.
I think given the potential value of the engine, the fact that the guy has a good idea of what he has and the family attachment involved that I would have to go in at £150 – with a promise to restore, look after it ans swing by when it's done – and see what where he things go from there. Thanks for all the info, you've been a great help. I'll keep you posted and when I go back to the shop I'll take some more photos of the various things around there that might interest you and I'll let you know where it is after negotiations 