Finally. Coolant issues have gone as far as i can make out. New coolant pipes, heatshielding, slightly raised header and a damn good bleed later i think its sorted.
Haven't done a massive amount of miles, probably about 20 or when fully warmed up, or on full boost as my MAF is dead but that doesn't really matter as it would pressurise as soon as it got to temp without any boost as the coolant obviously wasn't circulating properly.
I can also see coolant flowing into the header tank after the engine has shut off so i know coolant is flowing through the turbo and through the after run pump, which is also working.
Very happy.
New MAF next and fit my S4 TB.