Had a little play on the drive today with VCDS and I'm none the wiser. 
Set up to monitor the throttle position and pedal sensors (Engine, block 62) and a few other things such as air flow.
First, with ignition on but engine not running the pedal & throttle sensors all seemed to vary sensibly and smoothly.
Same after starting the car, everything seemed to vary smoothly as I moved the pedal up and down.
That said I haven't noticed the problem for a few days either. The only recent variation is that I have Tesco Momentum in the tank; it's usually Shell "cooking" 95RON. Could that be a factor?
I did check for codes and the only one was an engine coolant high temp warning, which I've never seen before. Possibly from some "spirited" driving to/from the Forest of Dean on Sunday. 
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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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