OK, so here's some relatively good diagnostic info. Today I have made 4 short journeys, all about a mile long and all in Tip mode.
1. About 9am with a cold engine, including my "dodgy right turn", seemed fine.
2. About 11:30am, with some residual heat from 9am, seemed OK.
3. Midday, engine still warm, thought I felt a couple of "twitches", decided to go out again 5 minutes later.
4. Just now (12:10) with a warm engine I had definite problems as described below.
Headed downhill from my house, tipped up to 3rd then 4th gear and stopped at main road very briefly, it dropped to 1.
Saw a good gap in the traffic and headed off, turning right it was definitely showing 1. VERY sluggish (for an S8)! 
Changed up to 2nd, still sluggish but eventually got to approaching 30mph and around 3000 revs (does that compute?).
Blipped the throttle (release, press) and it instantly felt responsive, revs unchanged but started to increase revs/speed with normal power.
Changed up to 3rd and 4th all normal, then slowed for a roundabout which it pottered round in 3rd; cruised around the block normally at 30mph in 3rd/4th and went home to write this.
Thoughts welcome. 
PS. I guess the thread title may be a bit off the mark as well.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
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".  (Even rarer than a D2 S8!) 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. Agate Grey/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. Added Auto-dim mirror, Leather seats, 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; 30th July 2014 at 11:37 AM.
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