Spooky, pop-pickers, spooky

Earlier this week, apopro nothing at all, Joe Dolce's 1981 novelty one-hit-wonder Shaddap You Face popped up in my mind. Such things happen at my age so I probably parked it somewhere in my cerebral cortex and carried on wondering what I'd gone upstairs for.
Now forward to this afternoon and I'm waiting to pay for petrol when the cashier, a man of my own age - who also happened to be listening to Tony Blackburn on the chart show, doing a rundown of the chart of this week in 1978, as I had before pulling into the petrol station, looks up and says that  TB had just said Midge Ure was on record as saying that Brian and Michael's Matchstick Men had kept Ultravox's Vienna off the number one slot.
'er no it didn't' I replied: 'it was Joe Dolce with...', and that's as far as I got-because the cashier finished the line for me by adding 'Shaddup You Face', or maybe he was addressing me directly for daring to contradict that colossus of pop, Tony Blackburn.
I checked when I got home, though. Ultravox didn't release Vienna until 1981 and it was Joe who deprived them of the number one slot,  not the cuddly Manchester folkies.