Thanks for all the interesting replies. I have enquired about the Mazda 'box upgrade (Vitesse). It comes in at £3.5k fitted incl. VAT. I am currently thinking of two possibilities : late model car with Mazda 'box as standard, job done, or earlier but low miles and excellent condition MT75 car with a galvanised chassis. If the prices are right then the earlier car could be a good bet. Thinking is that if its MT75 was okay then it's a win. If not then upgrade to the Mazda 'box and result would be a nice car, brand new 'box and still not too bad on the overall spend, at least still less than a very late car. Is that too much man maths?