Brexit cartogram

It was good to spend time with Ben Hennig at the GIS Day that we hosted at my school on Tuesday. 
I was expecting Ben to produce a map of the referendum results and he has delivered as expected.
He describes the map as follows:

The following map is a cartogram that shows the electoral areas from this referendum resized according to their total number of people entitled to vote. In addition, the vote share for leaving and remaining is shown in differently shaded densities, using blue for the remain votes and red for the leave votes (which complement each other to 100% of the valid votes)

Image created by Ben Hennig and shared under CC license - click for a bigger version