Literally everyone had a ZX Spectrum, or Commodore 64, or a BBC Micro if their parents were rich and thought that having the same as they had at school was a good idea.
They were cheap and ubiquitous, unless I suppose you were in one of "Iron Curtain" countries.
I suppose it's a bit like television, it would have been more popular where it was invented.
Did you live in the UK in the 1980s?
Yes.
> One specific model of ZX Spectrum
I do not believe this to be the case, that number appears to include the 128K and the Amstrad variants also.