Thanks for all the replies. An update, some background. My best friend imported this car years ago, had various different people do bits on it, never managed to get it on the road. Eventually it fell into my possession for the princely sum of £15k. Some of the work that has been done isn't great. I decided to spend the money and restore it. It is not a financially motivated project, meaning if I end up spending more than it's actually worth I don't care. I'm also not precious about originality to the "nth" degree so to speak, i.e. if a stainless tank is preferable due to corrosion issues etc.. then that's what I'll do, Boxster brakes and a cherry bomb I won't.... I've no intention of modifying it if that makes sense. I spent 3 months chasing round some of the people recommended above, even offering to ship the car to their site to get a full appraisal. This got nowhere. In the interim I moved from Sheffield to Guildford and took the car with me. My new neighbour is a mechanic. 60 years old, what I'd call old school, very knowledgeable. I talked it through with him and his knowledge on the car, model variants, engines etc.. is detailed. I visited his garage where he was working on, amongst other things a Jaguar SS100. He has a lot of restoration experience across a broad range of classics. Clearly he's not a well known early year specialist, but I trust his ability, and his garage is near me so I can see the progress, which is important seeing as I wasted months trying to get someone to look at it.
So far the car has been stripped and the bodywork dipped to allow for a closer look at the body shell. A number of panels are being replaced, inner/outer wing, sills, headlamp mount, front panel. I intend to return the car to it's original white, to keep the original brakes and refurbish them. The carbs have been sent off to be reconditioned by a specialist. I'll be spending some time trawling round the forum looking for related topics, but given my comments about not being financially motivated, I'd welcome any bits of advice that you think relevant. Will post pictures when time allows.