Thank you.
The UK has more of a set of conventions and principles than a constitution. We found out how weak that is when Boris Johnson broke the rules of Parliament to avoid losing a vote on Brexit, and made the Queen lie about it publicly in the formal announcement of the proroguement.
One of the principles is that no Parliament can bind its successor. For example, there was a fixed term parliaments law from 2010 or so that said that you need a two thirds majority to call an election before five years is up (rather than at whatever time suits the incumbent prime minister); when a new Parliament was elected in 2015, one of the first things they did was rescind that law, with a simple majority.
I worry that Farage, friend to trump and follower of Bannon, will become prime minister and lead us to such destruction that we will write an actual constitution, but that didn't do America any good once the supreme court was stuffed with Republicans loyal to trump.
I think the trick is to not elect tyrants, but Putin's propaganda reaches worldwide and the far right is rising everywhere. Perhaps it really will be global thermonuclear war this time.