PAssenger side...without hearing it, id guess at the gearbox being low on oil, that causes a whine when you drive, and gets louder and higher pitched the higher you rev the car, i work for mg rover and before a customer has the car whether it new or used, the car gets checked over, including gearbox oil level...not sure if that goes for where your car was bought???? i believe the belt should have been changed at 60000
Sean
February 2005