Welcome Ant, from a fellow Edinburgh member. I just picked up a 170 GT TDi after being out of Golf's for 6 months.
My last car was a 2004 GT TDi 140 with plenty mods done to it (I had a full GTI/Votex bodykit, Milltek exhaust, mapped to 180+ bhp and a few toys on the inside).
I've been on a shopping spree over the weekend so now have VCDS (subject to the postman arriving soon) and a stockpile of mods to fit.
Let me know if you ever want to meet up, I've had a VCDS before so any code reading, programming you want done gimme a shout!