Just an update for this thread with a little tip. 
I did this again today, actually reversing what I did in August last year. 
The replacement sensor failed, even throwing an error shown by VCDS, and was causing severe starting problems. So I put the old one back.
The problem with the old one was that it showed a low temperature on the dash, but otherwise caused no problems. 
Now I need to get a fully-working one and go through this process yet again.
I did this alone, without the help of the "small-fingered one" and getting that clip back in took ages! I managed by manipulating it with one hand and pushing it in with a long screwdriver held in the other.
The tip? Tie a long piece of thin twine around the "loop" bit of the clip and add a bit of tape to stop it slipping around. Just tape it on somewhere or hold the end in your mouth.
Then, when your cramped hands lose grip, it won't disappear forever behind the engine. 
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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