Regulars might park in your apartment's space if available, but many new clients wouldn't for their own security.

Isn't a landmark enough for spotting them Sparkly?
I kinda think that honing your screening and 'kicking out' skills is a more practical and safer bet than compiling car number plates.

I totally don't want clients parking in front of my flat. That kind of visitor activity is catnip to street facing neighbours. I don't think that's discreet at all, too much exposure. Unless you're in an isolated place.

As long as they can walk to the landmark so I can eyeball them that's sufficient.
Most of mine are tube or walk. But if they drive they work out the parking for themselves or I suggest a side street elsewhere.

As long as you can see them at a landmark or something then I’m happy.
I do tell my meets to park in a certain space, and I can see it from my window. If they didn’t want to park there(only had 1 so far) they’d need to walk to it. Basically I need to see them before I give my full address.

I do agree with salty, working on so and kicking out skills will be of more benefit than gathering car plates

But end of the day, you have to do what makes you feel comfortable to do this

I have never had an issue with this and has worked fine for me, I do not need to see them before a booking. Besides how would you know it's the right person.

My previous place was a basement flat so couldn't have worked anyway.