The UK is made up of Scotland, Northern Ireland, Wales and England. All have members of he UK parliament your Congress. Northern Ireland Wales and Scotland also have their own parliaments and have control of certain things like their budgets.
To be knighted you either have to have done well above and beyond to help your community, charities and the like. You can be knighted for services to industry and armed forces. MPs who have served for many years can be knighted and be given a seat in the house of lords. I would given.them a deckchair. Sports people and pop stars can also be knighted why I have no idea and many people say they shouldn't be. There are differently levels of Knighthood. You could have been knighted for killing a dragon but conservation came to late to save them and they were made extinct in the middle ages. The middle ages ended just before you were born. Some of those knighted can drive their sheep through central London but they refrain from exercising their right to do so as many sheep get stolen by kebab shops.
Unfortunately you won't get knighted for having a fish tank unless you supply fish to the queen to dine on. Seems if you have a lot of money and got it through debatable means you can also be knighted. Some of the biggest criminals in the UK get knighted but the fact they are criminals is kept quiet.
That's it in a nutshell but just about anybody can be knighted in fact a piece of steak was knighted in the middle ages and was knighted sir loin, I kid you knot that's true.