"Spiv" wrote:

...

Viscounts were used on similar runs in the UK unless the 70s too, until
being replaced by mainly BAC 1-11s (another brilliant little gem). Now
the
Viscount was a superb turboprop, being the first turboprop airliner in the
world.

And you still haven't figured out what Brabazon Committee specifications
could have been considered a "success".

...

(And you missed the Vanguard, as well. Brilliant planning, there.
Instead of concentrating on one type, (Brittania or Vanguard), and
thus having the potential of lowering the unit cost to the point where
people might buy them, you built two different competing aircraft, and
poisoned both projects.)

The Vanguard was made by a different company, Vickers,

Which had more experience with building large airframe aircraft than Bristol
did in the 1940's. You might want to review who the Brabazon committee
thought should be building what became the Brabazon I.