Appreciate your input, guys, but you're barking up the wrong tree!
Essentially, I have a new throttle position sensor (as per link), which I bought a long time ago and just wanted to fit it. I don't have a specific TPS problem, but I do have a gearbox issue which Stephens Engineering (autobox specialists) reckon may well be an electrical issue. I am therefore trying to go through the less-expensive sensors, etc. before looking into the box itself.
After having a new crank sensor fitted, the autobox issue disappeared ENTIRELY for three months. It then started to come back (I seem to remember it started to feel a bit odd again after having a jolt in the car from a pothole, but I may be wrong). Essentially, the box works fine on straight acceleration and changes perfectly, but if driving sedately at 30mph, the revs can suddenly rise by 1,000rpm and then it will go into 3rd with a jolt, causing limp home mode and management light on. It always resets after a restart. I've had the codes read and they are
P0730 Incorrect Gear Ratio
P1625-002 Controller voltage switch signal too low
It is NOT an ATF level issue (already checked). The issue first arose about 4 years ago as an irritating, but infrequent problem but it seems to be occurring more frequently now. As I said, Stephens reckon I need an autoelectrician to check it over. Problem is autoelectricians are as rare as hen's teeth round here.
Back to the TPS: Is it straightforward to fit my new one to the throttle? I may as well as there's no cost involved.