Britain has only traditions and laws, and the concept of Parliamentary Supremacy. In countries with Parliamentary Supremacy, there is not -- nor can there ever be -- a Constitution, because there is no power above the legislature. Rights Englishmen have enjoyed since Magna Carta can be swept away by nothing more than a majority vote.
Witness, for example, the English Bill of Rights (containing a few, very immature, ideas about ordered liberty.) That so called "Bill of Rights" contains a provision for the right to keep and bear arms. That provision was long ago destroyed in all meaningful senses by acts of Parliament.
Thank you for the reply. Very good post, although I would argue against the calling of the English Bill of Rights as immature in parts. I think its a better and more rounded document than that. Also Scotland also has a Bill of Rights. The US BoR was influenced by both.