Thanks for your thoughts everyone.
Okay so we're going to pop out a piston and have a look, to see if we could get away with just a new set of rings, but it's looking likely I'm going to have to go with the 9a/KR head combo, as the cheapest option. If I had mine bored out we're looking at loadsa money. Still looking at a total cost of the better part of a grand which is not good at this time of year! So to be clear; for a 9a swap, everything will fit okay, right? My existing metering unit/Kjet system is up to the job? 4 branch will fit, and the existing gearbox is cool? What about the cylinder head gasket; do we need to order one to fit the block or the head?
Scirocco GTX 16v (conversion) Eibach/KW suspension, Stainless exhaust, Rear discs.