The Sheffield 7V-BS was manufactured by Sheffield Radio Ltd in about 1941.
Actual code not known, shematic was found in the set - set was seen for sale in Australia
Valves (6 + magic eye): 6SK7, 6A8 ( 6K8 ?), 6SK7, 6SQ7, 6F6, 5Y3 and 6U5 Magic Eye
Chassis Notes (most schematics can be clicked to download a full size version):