Thanks guys, and yes I can make the fuel gauge move just by warming it up! I've checked the last three tanks and they were 12.6, 13.0 and 9.6 mpg...
More videos to come next year.

Next major job is a new exhaust (the baffles are loose in one of the backboxes - it makes a terrible noise when you hit the accelerator). I'm thinking of having a custom one built for it (the engine is non-standard and it's in a non-standard position in the engine bay, so a Flowmaster or similar will involve a lot of hacking about anyway I think).