OP - Hope you don't think I'm trying to hijack the thread, just updating on my last post.
After a lot of online research and talking to a few guys across the Atlantic who have experience with Cobb, I am going to take the plunge and order the Accessport with PDK flashing.
The map itself doesn't give massive gains - 5/6% at best. It's the extras that have swayed me... PDK relearn and being able to flash the PDK in addition to the map is proving really good in terms of extra performance. Some of the figures posted are excellent. I can have a custom tune through the Cobb if desired and the biggest plus point is that I can put the car back to standard at any point. Will report back when I have fitted it to the car.