Good research here, thanks.
I can confirm, being 10 at the time Ultravox - Vienna did sound incredible… BUT as soon as my pocket money hit, I was off to Woolworths to buy Shaddup A Ya Face. Good music is good music but sometimes Novelty is totally direct.
So with late night hindsight here. Had John Lennon not been killed, Vienna would have gotten to Number 1 and Joe Dolce would be just a very distant Chart memory.