Not a beutiful aeroplane, but a handsome one. Guardsvan, Vickers Vibrator - I don't know, never having flown on one. But legend has it they were not as smooth as the Viscounts. I saw them frequently at Manchester in the '60s.
'USSR' is deffo a 'Dart' sound, not Tyne.
Once flew (standing up behind the P2) Man to Jersey on a Viscount - take off to landing - no jump seat!). Then a week later home on an F27 (G-BMAP), on the jump seat that time. The Viscount was smooth and quiet. The F27 a noisy shed. How could an aeroplane with half the number of Darts be 4 times as noisy?
Vickers got it right with the Viscount.