I had recently had a audio install and heard that disconnecting the battery can erase maps so thought that might have been the case, also coming from an RS4 not use to the turbo kick.
You're bang on, lesson learned! It's easy to get wound up but when all said and done it's my own fault for not taking time out and looking into probable causes (ie DV!!).
Great bunch up at R tech just 300 miles away, still i'm willing to stump up two tanks of V power to get them on it
Thanks for all the replies