BOING - that was a Mk 2. Horrible bŁoody thing!!
The Avro 707C was a 2-seater; the 707A and B were single seat research aircraft.
The Vulcan cockpit was always intended for 2 pilots; however,I believe that Roly Falk once flew it with just himself at the helm as there was only 1 bang seat available on that particular day? Seem to recall reading that once.