So drove the car back from London to Bmth last week, everything was fine until the last 5 miles when travelling at 70mph the fault happened again. I put it in neutral turned the car off and on and it was fine - has been ever since.
Took it for diagnostics to a friend who's a VAG specialist, and several faults were logged; all to do with the throttle body, oh and a lambda sensor looked borked.
It's going back tomorrow as they noticed some corrosion on the electrical connections (but the engine bay was too hot to look in to further). So hopefully something conclusive comes back; fingers crossed it's not the throttle body as they're big bucks aren't they
Oh and the cruise control switch was flagged as broken- makes sense as cruise control doesn't work - do I just need a new stalk?