You’ve got to be registered to vote—and the deadline is usually a couple of weeks before the big day. Check your local council’s website; it’s easier than assembling flat-pack furniture. You can vote in person, by post, or even nominate someone to vote for you (called a proxy vote).
Here’s a fun comparison: voting in London is like ordering a takeaway. You’ve got options, you need to do it before the restaurant closes, and the result might leave you craving something different next time. Just make sure you’re on the electoral register, or you’ll be stuck watching the results from your sofa with a leftover curry.