You make it sound as if the UK has a constitution which is codified in some patchwork of documents, like statute law. But it isn't; it isn't even as coherently

You make it sound as if the UK has a constitution which is codified in some patchwork of documents, like statute law. But it isn't; it isn't even as coherently defined as something like the common law of murder, where you can make a pile of statutes and legal precedents and get a fairly clear idea of where the boundaries are. The constitution is very fuzzy indeed, and parts of it depend very much on how much political and media support someone can get when they point a finger and declare "unconstitutional!".