Oh shame on me with double egg-on-face

I'd just finished listening to The Archers when Mick's ice-cream van stopped outside.
I ran downstairs to confess that I liked his tune more than I liked ice-cream and could he please tell me what the tune was?
No, he couldn't, a friend-or-colleage had installed the tune.
He gave me a couple of blasts to help me memorise -
Dum-di-diddly dum-di-dum
da-di-la-di-la-da
dum-di-diddly dum-di-dum
da-di-da-di-da
thingummy-bobbly thinguumy-bobbly thingummy bobbly thing
ya di ya di ya di dah
ya di bobbly thing
and a little hunch made me Google Barwick Green
Oh for Heaven's sake!
It sounds remarkably different on an ice-cream van.
I went off to whittle some bricks