This is good but it’s not diverse enough for North West England. In ‘Wigan’ (as shown on the map) you’ve got the Oldham/Bolton accents (book - bewk; first - fussed) which are similar but as distinct as Brummie/Black Country.

In Merseyside you’ve also got Wools/Scousers, each with different patter and pronunciation. Not to mention Warrington and its accent further East.