Thank you for the replies. I had read about the tyre issue and thought I was getting away with it, sadly not. Shall be visiting my local alfa specialist asap to get the geometry setup.
I was wondering if it was a wheel bearing but the sound is still there while turning. I got another chance to check the brakes over again, well to an extent as the garage have put the wheel nuts on nice and tight and I couldn't remove them! Anyway the brakes don't sound to clever so im thinking the inner disc and or pad is badly worn, the car is on 57k so very well still the original discs. I've ordered replacements and hopefully this will cure the problem.