Hi Charley,
there is a wonderful spectrum of accents in Great Britain (the Kingdom that is made up of Scotland, Northern Ireland, Wales and England).
In England alone you have so many distinct accents it would make one's ears spin. Some are quite hard to understand, esp if one is not from here.
And of course we mustn't forget the gaelic languages which again differ so much that they wouldn't understand each other: Irish, Welsh, Manx, Hebridean, Orkney and Shetland).
Then there's Cornish, from the SW tip of Britain.
To help dispel your confusion:
Geordies are from Newcastle, Northern England, Glaswegians are from Glasgow in Scotland and Scousers you would usually find in Liverpool, in the North West of England.
More known dwellers are Brummies, Birmingham, Manks from Manchester, Cocknies (Cockneys?) from East London.
As a "non-native English speaker" it took me about 3 to 4 years of living in this wonderful Country until I could pinpoint where people come from according to their accent.
It is a linguist's paradise,
best regards
sparkle