You have also misunderstood BlackBerry. I did not say there are no Remain supporters outside London. In fact, I explicitly stated at the beginning of my post That I don’t see this as a north / south issue. You have put 1 and 1 together here and made 5, as so often happens in these threads..
The point I was wondering about (and many of us who are Euro living in Britain have wondered about) is the phenomena of what was known as the “ Red Wall” turning blue and I wonder why people felt so strongly about “getting Brexit done” that they would abandon their Labour roots and allegiances to Labour that had been held over many many generations.
That is NOT (I repeat NOT) the same thing as saying, “everyone in the north voted Brexit.” 
. Nowhere near.
I do think that if you live in a strong Remain area, surrounded by other strong remain constituencies in a highly populated area, to the extent you barely (if ever) come across anyone who voted Leave, you can find yourself wondering if your area is actually at total variance with the sentiment in the nation as a whole. Not the North, East, Midlands or West specifically - just Britain as whole. You just wonder if this different sentiment is tangible elsewhere - or not?
I will say once again, that people all over the country voted Brexit and many seats were marginal - obviously. Indeed, the shires and particularly the area of Essex mentioned were only ever going to go one way. But I was wondering about what actually underpinned the shift in the Red Wall constituencies, because this was quite dramatic as a political phenomena,