I cant seem to create a post myself but I'd just like to add my experience with Fahad/Premier Tuning, I went and got my diesel tourer remapped to stage 1 with EGR off a few weeks ago, I thought I'd leave it a week or two so i can comment on performance more reliably and also comment on fuel efficiency.
I went up to meet Fahad and I can honestly say he was one of the friendliest most helpful people I've ever met (even knocked off the price of the tune as I'd come up from Plymouth), when he was working on the car he asked me some questions and gave me some tips on maintenance and work I should look into getting done on my car and answered some questions I had, a really knowledgeable guy indeed.
When we went for a test drive I could instantly feel a massive difference, it was pretty overwhelming and 3rd gear pulled so much better than before. I have felt that way since, nipping around the lanes in Devon has become far more joyous, and although i haven't gone through many tanks of fuel since then, the MPG has risen from ~38 to ~42 that is what i have seen and it obviously varies from person to person but I can only put forward what I've seen myself.
I did however have to put in some unforeseen work as Fahads sticker applying skills while it's raining were not up to scratch leaving me with the address "PremierTing.com"

I lost the spare sticker he gave me for a while but i have since found and applied it on a nice sunny day.
I should add that i am running a stock clutch with 140k on it and it hasn't slipped once yet.
Cheers Fahad, great service.