Another thing i need to learn some more about, is, I keep reading references to a Uk "constitution" - but apparently it is unwritten and based on precedence ??
UK, New Zealand and Israel do not have codified constitutions. I say codified, because Acts of Parliament, over the centuries, make an informal constitution. My brother is a lawyer, and he told me that the British system is risky, because a malevolent Parliament could pass Bills which hurt the country. The UK Parliament passed a Bill at the start of WW2 which suspended elections for the duration of the War. This was not malevolent, but such a move would be impossible in a democracy which had a codified constitution.
If a malevolent Parliament passed a dubious Bill, the Monarch could refuse to assent to it. Such a move has not happened for over 200 years, but it seems possible. The Monarch wants his / her kingdom to run well, and avoid bad legislation, and avoid gridlock. In 1975, the Federal Government in Australia suffered from gridlock. Queen Elizabeth 2 rules Australia, as she does the UK, Canada and New Zealand. Her representative in Australia, the Governor General, fired the Prime Minister of the day, dissolved Parliament. and called a Federal election.
One prominent Australian politician, when interviewed on this matter, pointed out that the Queen, acting through her representative in Australian, can sack a government, but cannot appoint a new one. Only the people can do that.