Well MJ found the evidence (and showed it to me) of a definite coolant leak from the dreaded plastic oil cooler pipe.
Funny thing is, after getting home from the meet the level doesn't seem to have dropped. On the other hand what with driving sedately in Cornish convoys and terrible weather on the longer journeys there have been very few "overtaking opportunities".
So the revs have been consistently low. Indeed my gearbox had drifted off into "Cornwall mode" and was selecting top gear at anything over 30mph! 
As for the valve unit I have for the seat (the pump motor is in fact separate) I now know where it goes and it may be inaccessible to a "mere mortal".
The one I have seems to be a different design, but has the same electrical and air connections so I'll see if I can at least get at those and try it - nothing to lose.
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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!
Last edited by HPsauce; 12th June 2019 at 09:59 AM.
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