It's not even hard really, I did it lastyear. I book a visit to the city hall, they look into the address db and see when I registered the first time. I see exactlt the same thing myself when I login into the thing.

The official agrees with me on the appointment date to actually submit the application, that is after cutoff date.

I put a signature on one sheet of paper, pay a thousand and go my way. The thing takes 15 min tops.

But it's continental Europe, not UK