alt Hacker News> Speccy for me too, and most of the local people I knew.
Dundee? :-D
There's a theory made popular by Chris van der Kuyl (his dad Tony owned an Apple II, the first home computer I ever used - I played the Lemonade Stand game on it in his kitchen) that the reason Dundee is that everyone had a ZX Spectrum and so anyone with any talent got good at programming them.
And why did everyone have a ZX Spectrum in Dundee? Because they were made in the Timex factory just off the Kingsway (the building is still there, it's a furniture factory now), and everyone's dad knew someone who could "get" a Spectrum for them, bypassing the usual supply chain hassle.
The Planet Bar in Lochee probably shifted more units than John Menzies ever did.
I grew up in Yorkshire, though I'm half-Scottish there's no link to Dundee!
But the Spectrums were the best-selling UK machine at the time, so I'm sure there were lots of regions where they were super-common.
I think I had a friend with a BBC Micro, but I can't recall anybody else having something different.
(There was a bit of console-split later, between NES and Sega Megadrive, and later still between Atari/Amiga, before we all settled for big grey boxed PCs.)