One aspect of all this is that pretty strange everyone talks as the referendum results indicated that Labour voters in all the Brexit voting seats were overwhelmingly in favour of leaving.

That isn't actually at all clear - the Brexit vote in that referendum would have included the overwhelming majority of Conservative voters, together with a section of Labour voters - and many of those Labour voters could well have been more motivated by a desire to kick the Cameron government than by leaving the EU. The fact that in the election of 2017 most of those "Labour leave" constituencies returned Labour MPs suggests that this is the right way to interpret the referendum vote.

The thing to remember is that in the 2015 election not a single MP in the UK got as much as 50 per cent of their constituency electorate.