It cropped up at a gathering of Aria's family yesterday- Aria herself not being present- and of course we ended up singing it because how could we help ourselves? Becky even inserted a stray line of it into the singing of Happy Birthday To You.
Is it something all primary school children in the UK know? I expect they do.
Anyway, I'm reading Spring by Ali Smith- and last night I got to a bit where four of her characters pile into the front seat of a van and drive to Inverness:
Guess what they sing on the way...