vectra c 2.0dti cold start problem

[Ade-c]

I am having trouble with starting my car when it is around 10c degrees outside temp, the glow plugs wont come on till its atleast 3c, and i have to keep turning the car over with the starter motor untill she fires up on all four cylinders lots of smoke!
it seems worse when its a bit damp and i have parked on a slope for some reason

Any ideas?

[bigmac]

If it's worse when parked facing up a hill it could be leakoff pipes do a search there's a how2