And if the catalyst is faulty that should have been picked up at the MoT.
Not necessarily; I had a problem with loss of power in my previous car (a SEAT TDi) and it turned out that the catalytic converter was somewhat blocked. Car passed its MoT fine, and in fact it took ages to diagnose the cause as there were a number of possible causes, such as MAF, intercooler, turbocharger etc.
Because the problem had occurred over a period of time, when the cat was replaced, it was quite a revelation to have all that power back and the turbo whistling nicely again!
On my current car, every now and then I do rev it quite a bit in the hope that it will help that particular issue happening.
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