Times have changed, can you imagine these days car companies employing the same marketing techniques..
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Not sure I would buy one but if you must they are simple enough, but why are you thinking like this when you have a very similar small coupe in your garage. The Opel is rarer, better build and much prettier than the TR, OK the engine is based on an old diesel unit but it is rock solid and nearly unbreakable. Fix what you have leave the TR7 for those who know no better.
I have seen this and for £1500 (I recon) is a cheap way to scratch an itch and if I like it, I can update to an TR8 for about a grand:
http://www.carandclassic.co.uk/car/C508651
Looks reasonable, owner likes his strange cars a Colt Sapporro in the background of the first shot