Okay, here we go. Bowmen v United Kingdom is a fancy name for a legal case that happened a long time ago. It's like when you play a game with your friends but then someone doesn't like how it was played and they want to talk to a grown-up to help them fix it.
In this legal case, some people in the United Kingdom said that their human rights were not being respected because they were not allowed to vote in elections. They said that it was not fair because other people who were living in the same place as them were allowed to vote, but they weren't.
The grown-ups who were in charge of making rules and laws said that there was a good reason for this. They said that these people were not citizens of the United Kingdom and so they weren't allowed to vote.
The people who were upset about this said that it didn't matter if they were citizens or not, they were still living in the same place and they should have a say in who gets to make the rules.
The grown-ups listened to both sides and then had to make a decision. In the end, they said that the rules were okay because they were trying to make sure that only people who were citizens and would be affected by the rules were allowed to vote.
So, it's like if you were playing a game with your friends but only the kids who brought a certain type of toy were allowed to play. You might feel upset because you don't have that toy, but the grown-ups might say that it's okay because they are trying to make sure everyone has a fair chance to play.
That's what happened in the Bowmen v United Kingdom legal case - some people were upset because they weren't allowed to vote, but the grown-ups said that it was okay because they were trying to be fair to everyone involved.