Well done! What a relief to get the MOT sorted out.
The remaining engine hesitation until it warms up is a bit of concern, there's obviously still something not quite right.
Could it be the system temperature sensor? I can't remember whether you have replaced that, or just confirmed that its resistance is within spec?
It might be worth replacing it anyway just to be sure?
It's very awkward to get at, but basically straightforward, and you don't need to worry about water gushing out - it's a small hole and if you keep the filler cap tight and have the new sensor ready to hand you barely loose a drop.
I think I found a ring spanner of the right size was best - possibly even a cut-down one levered with a long screwdriver.
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