Or rather, accents of the British Isles. A brilliant but not exhaustive tour:
No Brummie (Birmingham), Geordie (Newcastle), Manchester, Cumbria, Potteries (Stoke-on-Trent), Derbyshire, Black Country (between Birmingham and Wolverhampton). The first three are big omissions. There are more variations within regions. He does Scouse or Liverpudlian.
He deals with some regional, but not class or “ethnic” or English-diaspora nuances. His Devon-Cornwall needs some polishing.
Voice of Andrew Jack, a dialect coach. He should do another, five-minute, take.