Robin, thanks for confirming that. I did not get any paperwork after the job was complete, and on that day i was in a hurry so never even thought to question it.
As for not speaking up before now. I work away for more than half the year, so when I am at home I have plenty on. I am away from home just now and have some spare time to follow a few things up, including this. The car has been running perfectly, so it's not been a huge concern, but thought i'd see if anyone else had experienced similar thoughts after a coilpack change. I am possibly just getting used to the extra punch from the remap and had that placebo effect of "just been to the garage, does the car feel different?".
Thanks,
Stuart