This is a solid piece of data analysis:
Lord Ashcroft: My EU election poll. Most former Tory voters say they will stay with their new party at the next election. | Conservative Home
So the UK's party system is realigning. As usual, the left wing is more splintered than the right-wing. (This is why right-wingers like "first past the post" -- it disadvantages more splintered coalitions and advantages more-unified minority groups like the right-wingers.) But the new alignment is Leave vs. Remain, with Leave voting Brexit or (fewer voters) Tory, and Remain voting SNP in Scotland, and LibDem, Labour, or Green elsewhere.
The Tories and Labour voters are basically habit voters, so they'll disappear as time goes on unless the parties are revitalized. The LibDem and Green voters are more committed, with LibDems caring most about Remain, and Green voters caring more about other things. The Brexit voters are just angry meaning that Brexit Party won't have staying power. The SNP voters are *strongly* committed to the SNP -- Scotland will stay 100% SNP for decades to come.
It's a curse that the UK doesn't have proportional representation yet, because it might lead to Farage as prime minister. If the UK did have proportional representation, he'd have no chance: a coalition led by the LibDems, with the Greens, SNP, and Labour supporting, would most likely win the next election. But with first-past-the-post, Brexit Party could win.
Dangerous times. I wish the election system had been fixed. It may become critical for traditional Labor voters to vote LibDem, and I doubt they'll do it.
May's Conservative Party faces historically worst election result in Brexit crisis - poll - Reuters
Northern Ireland is realigning around Leave v. Remain as well. As a result, the Alliance Party picked up a seat in the EU elections.
An anti-Brexit party just made an extraordinary breakthrough in Northern Ireland