During the EU Referendum campaign all the main political parties backed the Remain campaign. The opinion polls predicted a final 52/48 split for the Remain vote. The final vote was 52/48 win for leaving the EU, sending shock waves around the world. This seems quite a narrow win. However, Chris Hanretty, a Reader in Politics at the University of East Anglia, has estimated the referendum vote split for the 574 parliamentary constituencies in England and Wales. The actual vote also covered the 76 constituencies in Scotland and Northern Island, along with Gibraltar. This was not a simple task, as the vote was counted by local Government areas, which rarely coincide with the constituencies. He estimated that 421 of these 574 constituencies likely voted for Leave.
However, there was no geographical split of the figures. I therefore classified the constituencies by region, along with putting the estimated vote into bands, with shades of green for a majority to Leave the EU and shades of pink/red for a majority to Remain in the EU.

There is a huge divergence between the regions. London was the only region to vote Remain in England and Wales, with 71% of constituencies in favour. The next nearest pro-EU region was the South East, with 39% of constituencies in favour. Furthermore London accounted for 22 of the 26 constituencies with greater than 70% of the vote in favour of Remain. What is quite worrying for future political consensus is that in 39% of constituencies the vote was at least 60% for a position for the majority vote.

The split by political party is also revealing. Of the 574 constituencies, 330 have Conservative MPs, 231 have Labour MPs and the remaining 12 seats are split between four other parties.
The Conservative constituency split is as follows.

The Conservative support is mostly in the South of England and the Midlands. The divergence is slightly less extreme than for the total, with 94 of the 330 constituencies having at least 60% for the majority vote.
The Labour Party constituency split is as follows.

The Labour Party support is mostly in the North of England, the West Midlands, London and Wales. The divergence in vote is more extreme than for the total, with 123 of the 231 constituencies having at least 60% Leave vote for the majority vote. Over half of the constituencies with a greater than 60% Remain vote in England and Wales (34 of 54) are Labour. Also over half of the constituencies with a greater than 60% Leave vote in England and Wales (89 of 168) are Labour. Yet Labour have just 40% of the Parliamentary seats. What is worse for the Party, the divergence is regional. The Remain constituencies are concentrated in London. All the other core regions have a strong Leave vote. Even worse, the Party activists are strongly Remain supporters and are behind efforts to annul the Referendum result.

In summary the results show two things.
First is that there is a huge divergence in Referendum vote across the English and Welsh constituencies.
Second is that a disproportionate number of the constituencies with strong votes either for remaining in the EU or leaving the EU have a Labour Party MP.

Kevin Marshall