[Secret Agent Man]

and all the rest. plus a constitution lawmakers cant just get rid of by a majority vote in a particular session of congress, like when the ruling political party changes.

[Winniesboy]

Although it's true that Parliament is sovereign ('nothing may be done which Parliament cannot undo'), constitutional changes are actually extremely hard to bring about, and rarely happen. (Tony Blair found this to his cost when he thought he could abolish the ancient constitutional office of Lord Chancellor more or less by decree). For this reason I've always thought the differences between the constitutional permanence of the UK and the USA are less than is commonly supposed. After all, some of the US Constitution's most cherished provisions are the result of amendments, by definition changes. In both countries the Constitution can be changed, but in both only with great difficulty.