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Ah ok, didn't realise it was that clearly stated. I've only really got previous experience of cat modification, but even recently I've never heard of anyone actually fail the test on the part being missing or altered, only if emissions don't meet regulations.
3 years ago I had a 200 cell cat, tester was fully aware as we had a good chat about it. Tried a number of times to get it to pass, couldn't, so I put the standard cat back and stuck with that since.
efb
I swear last time I googled it I got much more official answers.
Taken from the Darkside tuning website
“ In the UK it is illegal to remove any of the original emissions equipment fitted to a vehicle from the factory.”
£1000 fine IIRC.