I bought it originally march last year, had been modded by qst, with full mtm exhaust, gearbox program and engine chip by the audi dealership before the original owner took possession. I had it for about three months and during that time had several problems with changing gear severely down when slowly accelerating. Eventually the car went into limp mode, took it in to Dovercourt battersea (bought the car in hereford), whereupon dovercourt noticed no serial number coming back from the gearbox, asked whether it had been modded and then promptly refused to warranty it.
South Hereford then came up picked up the car and a whole fiasco later, I sold the car back to SH for cost -miles, which was a good deal.
They've had it sitting on their forecourt for 9 months and I had a range rover sport in the mean time, which just didn't bond with, and eventually managed to get teh rs6+ back but at much discounted rate...
second time round thought i would be luckier!!

Did manage to get a whole two years new warranty with it aswell...
Will see what they say but hopefully I can take it somewhere a bit more local than Hereford!
As for the average speed check, it's as you come off the M25 at J12, head on to the M3 southbound for about a mile and ahalf, not on the northbound side heading up to the m25 so you should be ok!
Thanks bob