A little update on this, the problem reappeared twice yesterday evening near the start of a short run. Just significant lack of power for a few seconds, no other symptoms. 
I replaced the coolant temperature sensor (it was suspect) a while back and have been running exclusively on Shell V-Power Nitro+ for some time and all has been fine.
Checked the codes today and the 01119 Gear Recognition Signal (intermittent) was there again, but nothing else. It's about 3 months since I last checked.
The Ross-Tech Wiki just says 01119 is a note and to refer to the TCM/J217 for detailed codes. I presume that means 02 Transmission in VCDS or is it something more detailed I need to get at?
A document I found online also says that intermittent codes will clear quickly, so do I need to stop ASAP after an "event" and plug the laptop in?
Quote:
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Malfunctions that are stored in DTC Memory as sporadic malfunctions are automatically erased after 1,000 km (600 miles) or 20 hours.
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Though neither 1000km or 20 hours have elapsed since it misbehaved yesterday, so maybe the 01119 is not connected to the lack of power?
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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!
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