Re: Not got off to a great start!
I have spacers fitted on the fronts, some 155's are supposed to be fitted with them and they are about 6mm so they may be standard....or perhaps not. Would need to see a foto.
This bit worries me: "Went to get them balanced today (x4) and the tyre gadgie said there wasn't much meat being grabbed on the centre spiggot due to the thickness of the spacer and the only thing stoping the wheel from flapping about is the wheel studs."
The little spigots don't do anything really, except help locate the wheel when fitting and hold the disc on. If he means the little central lip then as said above, I've got 6mm spacers fitted with no probs.......
Sounds like a problem with your wheels/tyres. Also perhaps suspension or steering???