Well bit of a non update if there is such a thing...
Squeaking is still there even after having my right rear wheel bearing replaced (needing doing anyway) and the left one is fine. Bushings have been inspected and they are fine too.
Front and rear rotors and pads were recently changed and since then the noise had appeared. I thought it was just a coincidence.
Are there any part of the brakes at the rear that could be causing this squeaking/squealing noise?
Cheers,
Daren