It's done a bit differently, but there's an app on phones "The English Dialects app" you can install that will give you some specific features and how they distribute in Britain and Ireland. It will also try to guess where you're from, if you're from those parts.
It does heat maps of features, rather than trying to group bundles into discrete areas. This is probably more accurate, because it shows you were features are strong. Sometimes they'll correlate with others, sometimes not.
That might be quite tricky - I suspect the regional variations aren't quite as strong as they used to be but where I grew up (a small fishing village in North East Scotland) it was possible to identify people from a farming rather than a fishing background due to them having a different accent even though they lived perhaps 1km away...
Agree with you there - drive an hour in the UK and the accent and slang could be completely different (e.g. Manchester to Liverpool), whereas in the US you could easily still be in the same state.
"A tour of the British Isles in accents" https://www.youtube.com/watch?v=-8mzWkuOxz8