Well......not the result i had hoped for but a definite improvement !! The hesitation on the road seems cured but i have only done 12 miles... Stationary i'm not so sure. It seemed ok when i picked it up but when i got home it was popping in the pipe at 2k revs..but i can sort of hold 2k revs which is an improvement. I switched off, re started and it seems perfect but then after a minute it went back to popping.. I find that if i increase revs slowly from 1k too 2k it holds 2k well. If i rev too 3k and drop too 2k it pops in the pipe... that said its about 75% better but i will reserve judgement until i have done some miles.its possible i have a secondary ignition problem and it may pay me to fit the new iridium plugs and 6 coil packs i have in the boot ( I had hoped to ebay them as they are brand new) As for Guildford Audi ? well he asked would i be paying by cash or card and i said neither, this is down to Audi GB and he later confirmed that it was done under "goodwill".. but then they said there was nothing wrong with it 6 months ago and their was no ECU upgrade and they supplied the car...So i doubt others will get it done free there. I cant say they were happy about any of it and their attitude to this whole problem stinks.Not just Guildford Audi but Audi GB as well.. I dont however think this is a Audi only problem, I don't suppose the service from any of the big makes would be any better as they are more often linked by the same company groups anyway. the real difference with Audi is you are paying top dollar for a top dollar service and you simply don't get it IMHO.. Would i buy another audi....Yes if pushed because i feel i have been unlucky and would a BMW really be any better ?? I will report back after a few more miles but in short, its a fix worth doing even if you have to pay but bear in mind the original fault might have now caused other faults,, i noticed on the service sheet the guy was holding, something about Lambda sensors..