Your doner car has to be pre Aug 95 for you to not have to run a Cat on the roadster. At some point before aug 95 it was legislated that commercial cars had to run a Cat; but in building a kit car for some reason the date of the doner engine for a Cat to be required is aug 95.
I also believe that once your kit car is registered as 'no Cat required' then thats how the car stays, irrespective of any engine swaps you make further down the line.
I think thats all correct, its the reason I searched long and hard for my 1993 mondeo Zetec doner.
Josh
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