Whilst acknowledging that any divide is a broad generalisation to begin with.
I refuse to believe that Wales doesn’t figure at all. Wales is as varied as England - in its terrain, its regional cultures, and its dialects. Monmouthshire is as different a place from the Rhondda as the latter would be from Carmarthen. Carmarthen is different from Aberystwyth, as Aberystwyth would be from Anglesey and Anglesey from Wrexham and Wrexham from Powys/the Brecon Beacons. Though the Valleys are barely separated from Cardiff, accents change significantly crossing between those mountains that bound Cardiff to the north.