A few weeks after i first got it i did notice what sounded like a rear wheel bearing noise to me but only some road surfaces showed it up.Mot bloke showed me that rear ns tyre was wearing funny and stepping and said this would cause same noise,after a couple of motorway runs even that has now stopped!
By odd coincidence, I had the same thing suddenly appear with the NS rear tyre, quite severe feathering of the block pattern on the inside, with noticeable scalloping. I knew the wheel bearing on that corner was starting to get a little noisy, but I didn't connect it to the tyre wear.
I replaced the bearing, which solved the bearing noise, but by then most of the noise was coming from the tyre. After checking the obvious, rear tracking, bushes etc., I was starting to suspect shock absorber, but I fitted a new pair of tyres on the back and put the rear pair on the front. The noise obviously transferred to the front, but never got any better - so I ended up putting a new pair on the front too.
The odd thing is, the new rear tyres have been on for several thousand miles now, and after finding no other problems, there's absolutely no trace of unusual wear whatsoever. That leaves either a faulty tyre, or the wheel bearing that was causing the odd wear.