I remember the amazingly noisy beast very well - completely different sound to all other aircraft and this was in the days when a turboprop could be followed by a jet and then a piston of two or four engines so very different to todays fairly generic noise.
Saw it departing from LHR 23R and landing on the recip runway. Seemed to be included in the takeoff and approach flow . Perhaps because there were not many city centre to city centre pairs as options back then and also you could probably get a cab from LHR to most parts of London with a journey time of well under an hour. That would mean there was not much incentive to buy a hugely complicated and rather weird looking machine when you could do the same job airport to airport with a Viscount much more cheaply.
A great idea but I guess as so many 'great British innovations' not to much market research done to determine the real potential