Jack up both rear wheels and spin them.Compare smoothness,a worn bearing will sound/feel rough as you spin wheel.This is what us MOT testers do as part of the test,as well as check for play.Most modern cars have non-adjustable wheel bearings so any play should be investigated further....it`s a sign that bearings are on their way!
I think bearing kits are around £20 or £70 if hub is damaged.
If on the other hand it is a front wheel bearing(more likely),then it is possible that it was damaged when the old discs were hammered off.....common problem.
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