Its not metallic, It sounds more like a stone in the tyre, i have checked the tyres are they all look fine though. Its a dull thudding sound.
I have just recently had the front tyres changed in September and the rears in august. Could this possibly be a wheel out of balance or a tracking issue? I would say the car steers very very slightly to the left if I take my hand off the wheel, but this could just be road camber?
Thanks Again.