[zarzavat]

The UK does have a system of judicial review and various laws are classed as “constitutional” (such as the Human Rights Act) and have special protection.

The UK courts are currently weak because the government threatens their independence. But the same thing is happening in other countries such as Israel, so it’s not something that a written constitution can prevent. Ultimately the only thing that can guarantee judicial independence is for people to believe in it, and for people to take to the streets. Most British people just don’t care, that is the problem.