found the prob. pulley was straight on power steering pump however at low revs you could visually see the pulley moving about -even though i had checked the pulley for play. so i thought if the noise goes at higher revs it might be the centrifugal force straightening it and the reason it comes back at low revs is cause there isnt enough force there to keep it straight, making it move about? anyway second hand pump it is , cheers for the help. in the mean time is it ok to use the car with the bad pump untill pump comes ?