They lack a written constitution- in the UK the constitution is essentially what the judges say under common law.
The parliament has plenary authority to change the law including the powers given to the monarchy and House of Lords at any time, and there is no bill of rights restricting that power. Hence the “hate crime” prosecutions, etc. Over the past century and a quarter the Brits have effectively replaced a well-ordered but aristocratic system that preserved rights with an an elected mob in the House of Commons.