Maybe discuss it with a local who actually understands how parking permits work around here first, or at least have the basic courtesy to discuss it?

From the wiki for access=permit:
"Open only to people who have obtained a permit granting them access, but permit is ordinarily granted. If permit is hard to obtain, then it is typically access=private."

In most London boroughs, residents are given an allocation of visitor permits. A permit is therefore very easy to obtain on request.

