I assume most people here already are registered but just in case: here’s the link.
there is no law requiring you to register in the UK
You’re talking bollocks.
"What happens if you do not register
You must register to vote if you’re asked to do so and you meet the conditions for registering, for example you’re 16 or over and you’re British or a national of an EU or Commonwealth country.
If you’re asked to register and do not, you could be fined."
Thank you for being so polite.
The question I answered was ‘why we have to register to vote’. We have to register to vote, because there is no law requiring you to register where you live - as opposed to Germany where they have ‘Meldepflicht’, which means you must register with the local authorities when you move. If there was something similar in the UK, then there would be no requirement to register, the necessary documents to vote would be sent automatically.