I'd argue otherwise. Greater London had a GVA per capita of £42,666 in 2013. Several counties had a GVA per capita of less than £19,000, with the least productive (Northumberland) having a GVA per capita of less than £15,000. Excluding Washington DC (which isn't technically a state), that's a significantly greater disparity than between the most and least productive US states.
The UK has seen a huge rise in populism in recent years, I think overwhelmingly because of this stark inequality. Just as in the US, people from less prosperous areas feel marginalised and ignored.
America has Trump, we have Brexit - a decision by the electorate that has shocked the political establishment to the core. Few commentators saw it coming, the overwhelming majority of educated people think that it's a terrible idea, but it still happened. In both cases, the most reasonable interpretation is that a large part of the electorate have rejected the status quo outright, regardless of what the experts might say and regardless of the consequences.
I think that something needs to be done urgently about inequality, or things are going to get ugly. Too many people have lost all faith in the establishment. Too many people feel that they have nothing left to lose.
https://en.wikipedia.org/wiki/List_of_ceremonial_counties_in...