Idle speed stabiliser is one of the chief suspects but disconnecting it doesn't seem to make much difference
The cold start injector was checked as part of the tune up and seemed to be fine.
I forgot to mention that the exhaust doesn't smell right somehow (the tuning man agreed but the emissions checked out fine).
I've been monitoring fuel consumption as well - it does 30-33mpg on short trips to work but did 40mpg on a recent 400 mile round trip to Stansted, cruising at around 70mph. These figures don't seem far from what I'd expect so there cant be that much wrong wi it!
