Much discussion of Essex is really about the bits of the county that moved into Greater London in 1965, not the county as it exists now. It's also a very large county (getting on for 2 million people) and as such pretty much every summary fails to cover a substantial proportion of its population.
Reminiscent in a way of discourse about Orange County (CA) in the United States, where both supporters and detractors still see as the supermajority middle to upper middle class white county it supposedly was in the Reaganite 1980s but obviously is not now.