Thanks for the great advice, especially CJH who hit the nail on the head, i jacked up the wheel and sure enough the wheel wobbled about worse than a speeding shopping trolley! Dont worry, i wont be driving it until its sorted. I couldnt feel the wobble without the wheel jacked up because the car is so heavy (compared to my lil' pug205gti anyway) and the handbrake was on, both of which take up the play.
Hopefully when i get this sorted there will be nothing else wrong (i suspect this was the cause of the interrmittant wheel wobble too) and i can enjoy some serious driving. I will also be checking all the other bits and bobs mentioned (shock mounts, boot wiring, ball joints, h-brake) this week.
Then i'll get some new side trims (the M3 ones where nicked) and post some photos cause its in mint condition!
Once again, thanks for the response, i feel in safe hands!