Chugalug,
I did not wish to muddy the waters ref the RR Tyne proposal. Good engine though the Tyne undoubtedly is it would have ruined the Herc. Of course the Spey WAS shoehorned into the Phantom But this would entail 'thread drift'. Ah yes the observation dome. A lot ended up in crewrooms as receptacles for various liquids and nervous crewmembers could use the top bunk and sleep in peace . And the Smith's autopilot problem at least got our crew duty day reduced from 19 hrs to 16 hrs.
Once did a blind drop trial through cloud using the Decca. The troops landed miles away from the DZ.