Saddest one I saw was D1 BLO on a tatty purple Lambo (might’ve been a kit car, I wouldn’t know) which was ragged up and down Haringey Green Lanes every evening. If D14 BLO was already taken, you’d get something else, surely not Diblo.
Rant: Last time I hired a motor in the UK I couldn’t fathom how old it was or where it was registered. Is that not a thing anymore? Maybe I’m just sad but I miss being able to read ‘Barrow in Furness, 1976’ in a number plate 😀
The format changed here in Spain too. I was glad to get rid of my old SS San Sebastián one as it pretty much guaranteed getting stopped and searched in France in the old eta days.