OK it's not British, but here's cheap & unusual fun for someone while you're building your car.
http://www.ebay.co.uk/itm/291521574788?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Unbelievable amount of moaning from get-a-life posters on BAT last time this was listed. Perhaps forum members here are more broad-minded.
That Lexus engine might be an interesting option, as the seller says, for other conversions. Their V8s do have a good rep.
Ivor
I've always liked the BiTurbo.
But if you've ever driven a stock one, the engine was a miserable, hateful thing.
That Lexus swap would turn it into a really nice ride in my opinion.
Cheers
Fred
Unsold for peanuts.
Sad.