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Does all the power rest in the House of Commons? What is the House of Lords? Does the monarchy have any power? What power does the prime minister have?
Now even after making an effort to learn I can't quite wrap my head around the House of Lords but I know they do something as they are a bigger chamber than the Commons, I know they are the upper house in the UK parliament like the Senate in the US but they don't do the same things.
The monarchy has no active political power but they play a cermonial role in government so in that sense the government can't function without the Crown as the Queen has to approve the formation and the dissolving of any government and the Queens speech each year at the start of the new parliamentry session lays out the governments agenda to the country.
The Prime Minister is in practical terms commander in chief like the US President, while in legal terms the Sovereign is the Commander in Chief of the Armed Forces the PM has power to order deployments and instruct and authorise the use of the UK's nuclear weapons.
The PM also makes all Crown appointments and advises on things like judicial appointments and knighthoods and other honours although some of these things require approval from other bodies, in the same way a Supreme Court Judge must be approved by the Senate.
There's a lot more that I can't remember right now.