in 1510844 20160729 010301 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?
--
Dave - The Medway Handyman

I grew up (40s & 50s) in North Kent and never heard of it.