What do you class as the political parties implicit role? Ignore the referendum result? For sure labour has imploded largely because of differences between Corbyn and his MPs. The Lib Dems are (and pretty always have been) a non entity. As to the Welsh, I see no problem there. The Scots are not consumed with independence, just Nicola Sturgeon. Northern Ireland may be a different story, with a major shift in demographics over the last 50 years and Catholics now outnumbering protestants they may well unify. This would solve a major headache for the UK.