We are not happy. (Or any of Snow Whites other friends in case you ask). Finished the turbo swap today and ran the engine. Smooth up to 2500rpm, bag of squit 2500-3000, then spins up smooth again. At least I know the turbo is ok. Diagnostics indicate the intake air temperature sensor is detecting a fault (its incorporated in the MAF sensor). I've got a spare one, will drop it in tomorrow and try again. I do hope that is the problem, its under a minute to change the MAF, including putting the kettle on.