A while ago I had the `pulling to the left problem' with my secondhand 7 month old 112 (!) point Network Q car - a Signum 2.2 Elite. Two main dealers did not get it right, and so I went to a tyre place in Hemel Hempstead with a Hunter DSP 400 full geometry machine. And surprise, surprise they knew how to use it good effect.
In nutshell my rear wheels were pointing to the right .. and the cambers were out. Also it seems that with the front camber, the car will pull to the side with the most positive camber setting - if I have got that right !)
For what it's worth here are the MY 06 settings for the standard suspension-
front camber = minus 1 deg 2 minutes +/- 45 minutes (sport 1 deg 05 +/- 45)
front toe = 0 deg +/- 10 minutes (sport = ditto)
ride height 360 - 364 mm (hub centre to wheel arch lip)
camber = minus 1 deg 53 minutes +/- 15 minutes (sport = ditto)
toe in = + 0 deg 34 minutes +/- 10 minutes (sport = 0 deg 24 +/- 10)
ride height 385-389 mm
camber = minus 1 deg 17 minutes +/- 15 minutes (sport = ditto)
toe in = + 0 deg 12 minutes 30 seconds +/- 10 minutes (sport = 0 deg 4 mins 30 sec +/- 10 minutes)
Vehicle is weighted up with 70 kg in each front seat (footwell in my case) and half a tank of fuel.
Also I must say that I am not that keen on the steering on both the Omega that I had, and this Signum. I also drive a couple of Rovers and a Mitsubishi and find the steering on these to be less `wooden'.