David Lang wrote:
I'm trying to research the usage of the word "Gavver".
It's commonly used in North Kent as a slang term for the police. As in
"run, the gavvers are coming" or "I've been nicked, I'm at the gavver
station.
It's not a derogatory term like 'filth' or 'pigs' but general slang
like 'rosser' or 'old bill'.
Could you reply with your location and whether or not it's common in
your area?

NW England.

Never heard or seen this word before today, and that includes 17 years on
the internet