Hi all, cheers for the help again.

Had the caliper off today and the noise can still be heard. Took the rubber gaiter off and there was grease inside, put some more in, and its still squeaking!!! :-(

Could it still be the disk if I took the caliper off? It sounds like it is coming from the other side of the disk (inside wheel arch where driveshaft goes into hub)

Could it be the driveshaft has given up - do they normally squeak when they've had it???