The US government is designed to be inefficient and requires bipartisan agreement or a majority in both chambers to do stuff.
The UK government has significantly more executive powers, far more than the president, and normally has a majority to pass things that can't be done by the excutive.
the problem is that brexit and bad party leaders has been exceedingly disruptive and killed both the conservative and labour party. This is because it ripped apart the coalitions inside both parties. Suddenly the us and them was not our party and thier party, but people within the same party.
The competent have been driven out by the populists, and then they've burnt up and been replaced by the "tim, nice but dims". (populists were boris and corbyn)
Until we actually "deal" with or defuse brexit, and actually begin to structurally reform large parts of the country (education, industrial relations, health and local government to name but a few) we are going to be stuck