I assume most people here already are registered but just in case: here’s the link.
It’s not an offence to refuse to register to vote. You sure you weren’t being scammed?
https://www.gov.uk/electoral-register
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.
You shouldnt confidently state things that you are uninformed about
Apparently since 2013. Yes it is. Took a while to find the law. So honestly the gov really did not point it out to folks. The ID stuff overrode this change.
It only applies if a registration officer actually asks you to do so. And that request must be given in writing. So honestly I can’t help but wonder why they felt the need to add it.