When I flew the Prince of Wales in a Vulcan in July 1971 (he was finishing his training at Cranwell and the RAF decided to let him experience front line aircraft - Phantom, Nimrod and Vulcan), he flew in the co-pilot's seat. The sixth crew member (Pete Perry), other than serving sandwiches and drinks, could reach from behind the co-pilot's seat and operate some switches (pressurisation, air-conditioning and anti-icing). The rest of the crew was standard with two navigators and an AEO.