[FunkyMelon]

Easiest way to tell for early HG signs as said is hydrocarbon test.

If you don't have one of those, take it for a nice long hot drive so it's all up to temperature, don't use it again, leave it on the drive overnight till it's stone cold again and release the expansion header the next morning. If there is any pressure release or noise then you have exhaust gasses in the system and your HG is likely on it's way out.

Saw the car you got on eBay a week or so back, looks good spec and AWD is rare in T5 form so will be good if you get it going.

EDIT: Blue smoke is burning oil, could be piston rings, stem seals or possibly the oil return seal within the turbo itself.