Please do. I'd appreciate that. Thanks:)
Sorry this took so long. I haven't had the time. Prepare yourself for a bit of a history lecture.
Although the English Constitution is not written down, there are laws and government adheres to them.
Now, according to the English Constitution, the monarch
does have power because they are the executive branch of government. By law, the Monarch has to sign bills in order for them to become law, but the Monarch can also refuse, veto, a bill. Also, the monarch is supposed to be allowed to pick the Prime Minister and cabinet ministers, although they don't anymore. Parliament picks now. The reason why is basically the same as the reason why the monarch no longer vetoes bills.
Of course, the last time the monarch vetoed a bill was in the 18th century (correct me if I'm wrong here, fellow historians, I'm foggy on this).
Now, that being said, let's get to political parties.
Political parties are actually a recent invention in English history. Before Edmund Burke defined political parties as a good thing in government, parties were frowned upon because they were thought to splinter government. Therefore, political parties really didn't appear in the political scene until 1769 on, so late 18th century, a few decades before Queen Victoria takes the throne.
Political parties are not part of the English Constitution, but there was no stopping them from forming after that. Parties back then were organized groups of politicians who met at an establishment to talk about the politics and whatnot because they had the same views. In Parliament, it was true that parties were present then, but members could cross party lines rather easily for one bill or another.
However, with the development of parties, there also came the threat to the crown: no longer did all of Parliament adhere to all of the Crown's beliefs. Parties made it so that large groups of people were backing one idea or another. And so, instead of dismissing one member of Parliament and replacing that member, if a bill was not signed, there was a threat of several hundreds of statesmen resigning on the spot, leaving the monarch with a limited amount of time to replace each and every one of those politicians with capable or willing people. Moreover, for a bill to even reach the Monarch, it had to be passed by both houses and with a majority. Therefore, refusal to sign a bill may mean more than half of the government just getting up and leaving. A country cannot run with half a government and still call itself a Constitutional Monarchy. You need both a parliament and a monarch.
Of course, there are rare times where Parliament doesn't have strong parties, and when that happens, the monarch then may be able to exert his or her influence on Parliament to make them pass laws he or she wishes. However, those times are rare and it certainly didn't happen during Queen Victoria's long reign!
The result is, Queen Victoria signs bills, but cannot refuse, even if it goes against her conscience. What Queen Victoria is, though is a figurehead. She is there to be the leader of morals and the leader of society. In short, she is a celebrity and she still does ceremonies and such.
Sorry I couldn't explain it better. Feel free to correct any mistakes, guys.
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As for the lack of a written Constitution...I think Britain just doesn't want to write it since they don't need to. They've managed this long without writing one and have been fairly peaceful as a country as opposed to the other countries who squabble over the Constitution and have revolts over laws and such (see 19th century USA--if you ever read Bagehot, he talks a lot about how their Constitution is worse than the English one. He wrote
The English Constitution after the Civil War in the States). Besides, like John Clayton said, written Constitutions mean that you spend more time debating and tip-toeing around the Constitution to pass laws. It just delays the whole process too much. Also, an unwritten Constitution means that it is more flexible so it may change with the time. Whatever becomes law automatically goes into the English Constitution.