Flew on Danair 4B and 4C on inclusive tour trips Gatwick to Montpelier . The latter back then had a charming little airport with an outside 'departure lounge' which was after passing immigration and was pleasant little garden with some seats and little wooden gate which the staff opened to let you walk across the ramp to the plane.
Didn't strike me as noisy but I sat forward or on the engines on this trip.
Flew on several Trident trips -all BE/BA except Cyprus airways which was BEA in disguise. The T1 s were very short range as I recall Paris, Amsterdam and the like. Several T2 trips down the eastern med and several T3s which I thought a very good looking aircraft. Noisey on outside but not inside and I agree with the poster who said they were pretty modern for their day. The shorter body ones were very fast as I recall having the flight deck pointing out us overtaking DC9 and VC10s at some point.
Sadly as all British aircraft not built for a global market and probably could not have been produced in large quantities anyway.