Umm .. from the top of that very page .. > Historically, "No Act of Parliament can be unconstitutional, for the law of the land knows not the word or the idea.

Umm .. from the top of that very page .. > Historically, "No Act of Parliament can be unconstitutional, for the law of the land knows not the word or the idea."[3] Since the Glorious Revolution in 1688, the bedrock of the British constitution has traditionally been the doctrine of parliamentary sovereignty, according to which the statutes passed by Parliament are the UK's supreme and final source of law.[4] It follows that Parliament can change the constitution simply by passing new Acts of Parliament. So, basically no, it doesn't have a constitution analogous to the US Constitution.