Here is a view without knowing the details.

I have a good relationship with a very reliable nearby garage who is happy to do work on our cars or just an MOT with the same customer satsifaction.
They even encourage me to do my own work on our cars.
My TF failed on emissions and it has an after-market "short" CAT.
My mistake was to present the car relatively cold. The water was up to normal but the engine itself was not.
The garage principal told me that many modles of car suffer from the same problem. They are fine when fully warm.

Could this cause help you pass?.......

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