So, quick update..
I've been on lates at work all week, Monday and Tuesday I commute 45 miles to Manchester and back. So Tuesday morning I got up early and cut the evrymod wiring. It's made a massive difference, no more juddering at a constant speed, idles properly and just generally seems to run better.
It's still dropping boost at 70 in 5th, even if you cycle the ignition it happens almost straight away again. So I just put it on cruise at 72 (which according to my ultra gauge that's plugged into the OBD is only 65 haha) and trundle along which is seems quite happy to do, it just uses a bit more fuel (still does 50+ to the gallon though on the trip) So the oven cleaner enema is next on the list.
I also bought a £10 head unit from China on eBay to replace the VW cassette player that had just been thrown in the dash, so now I've got a green head unit, and Bluetooth connectivity!
Genuinely looking forward to making this a tidy car again, without having to spend silly money. Which is lovely after having R56 Minis/ EP3 Type R that cost me an absolute fortune just to keep them running.
One question I do have which is mainly directed at those who've done this, what other seats from the VAG platform are a direct fit (or need minimal work to fit) I'm after something just a little more comfortable because as you can imagine after 22 years and 169k, the drivers seat isn't the most comfortable place to be anymore and I suffer with a bad back. I'd quite like to retrofit heated seats to it but they aren't a necessity.