The UK seems to have bought into identity politics in general much less than some other places.
I think the press is much better and larger in the UK than in some other countries. Canada for example only really has two national newspapers and not much in the way of good smaller ones either.
The House of Lords as mentioned above, but also the fact that the courts can't overrule legislators in a way that pushes new laws. And the common law tradition I think is far more robust than some of the constitution based systems.
Fundamentally I think the temperament of the UK is pretty conservative. It's not inclined to wipe everything out in a revolution and start over.