Sorry to bump this again but this fricking issue is still there. I have changed the MAF and the crankshaft speed sensor (G28), and stil intermittently I get the TCS light come on solid and there is marked juddering under acceleration (and minimal ability to accelerate further).
Weirdly, it almost always manifests at the same spot on the commute home - on a downward stretch of the M4, just before I over a river bridge.
A stop/start usually clears it for that journey.
Thanks for any insights.
H