Hi I know a Tumbling Hill Street. It is round the back of the University and College and down towards Thornton Road. My 1966/7 street list says the following. Tumbling Hill Street. ( two portions) Thornton Road to a point 17 yards south west of Carlton Street, and from Richmond Road for 84 yards. It actually runs from Thornton Road up to Richmond Road and is in the Listerhills area of town. Regards Lynne