it seems to happen at high speed, ive tried pulling on the handbrake (not hard) to see if that changes the sound but it doesnt, so thats why i thought it was the bearing,
i did take the wheel off and its a drum brake wheel, with a metal cap, i think that is prised off and a big nut there? there is a nipple which fits into a hole in the wheel, not sure if that needs removing too?
looked on ebay and a new bearing is about £70
what tools do i need?