A small group of judges appointed for life passing down laws isn't exactly a brilliant "check and balance" in my opinion, and UK has the House of Lords for that. Let's not forget that Boris Johnson was eventually disposed by his own party, unlike that blond tit on the other side of the pond.
The electoral system is the problem in both. The nuances are different, but by and large the causes are the same: alternating power between two parties where national issues and "the party" have become more important than "representing your constituency". A lot of the important issues fundamentally are national issues, so that's not really a surprise.