I’ve seen VA91 NAL near where I live in Manchester. Perhaps he/she is a gynecologist?
No you’ve not, that’s not around for about 30 years! Nobby’s VA61 NAL works though.
For the current format you have shown there, Yes they do.
They have to stick to it exactly.
He’s right, in the US you can have whatever you want, and we have some older ones (like A3) which work, but you can’t have any random combination of letters and numbers, you can never have “I” or “Q” in there either (although “Q” was used for kit cars and the like as a registration letter).
Which means AM1R1CH isn’t possible. A111RCH is, with a dodgy screw placement.
Chap I know had one illegally spaced to better spell his name (but no screws or dodgy fonts, totally legible, basically had it LNN NLLL), got stopped by the police and fined on the spot, then got a stroppy letter from DVLA telling him if he didn’t correct the spacing they’d revoke it.