I haven't actually taken them off the car yet, but thinking about it last night, i may have another problem. When i first built the car, it had only done about 25 miles before it went in for geometry setup, and i remember them commenting on the top mounts saying the spring was jumping instead of the bearing turning.
think i will pull a front corner off the car and have a look in case it's something daft i have done when I've put it together.