Also, unlike the USA written version, the British Constitution can be easily changed by Acts of Parliament, with thousands of 'revisions' over the centuries. Maybe the next Law to be enacted should be to reform Parliament, getting rid of the House of Lords, reducing the number of MP's, and charging them with the defined legal responsibility to carry out the wishes of the majority of the electorate, with it becoming a criminal offence to not lodge your vote during National Elections and Referendums.
Radical? Yes, too true, and this country needs the changes now! 
Having a written constitution has plusses and minuses. This shows the difference between our (UK) system of government and the US system.
In the UK, Parliament is sovereign. Parliament alone can institute any law, revoke any law, and modify any law in any way it wants by a simple majority. HMG can introduce an act to say the moon is made of cheese, and inhabited solely by Unicorns and Magic Money trees. If they can get a simple majority of 50%+1 of MP's to vote for it then from that point on, within the juristiction of the UK, then legally the moon IS made of cheese, and populated by mythical beasts and flora/fauna.
In the US, Congress/Senate are NOT 'sovereign' by simple majority. They cannot legally modify or revoke the constitution on their own. The constitution is 'above' the law (in UK terms), and requires a 2/3rds majority in congress, and a 3/4 majority of the individual states for any amendment to be passed.
https://www.archives.gov/federal-register/constitution.
There have only been 27 amendments to the constitution since it's adoption in the late 1790's. The last one was adopted in 1992, but took 200 years to come into effect when Missouri, Michigan, New Jersey and Illinois finally ratified it in 1992.
https://kids.laws.com/27th-amendment. The previous amendment (the 26th) took 100 days to be ratified when lowering the voting age to 18.
There appear to be 6 outstanding amendments which still haven't been ratified - the oldest dating from 1789. I CBA to look them all up, but if some groups of flat-earthers in the 1790's decided the moon is made of cheese, and inhabited solely by Unicorns and Magic Money, and all it needs is one more state to ratify it then Neil Armstrong/Buzz Aldrin might be in trouble.
https://en.wikipedia.org/wiki/List_of_a ... amendments