Green’s Dictionary of Slang

jakes n.3

[jack n.12 (2)]

(UK Black) a police officer.

67 ‘Today’ 🎵 In a 4 door truck with the dot / See jakes then I swerve and I’m off.
theculturetrip.com ‘Guide to London Slang 10 Jan. 🌐 Jakes – police on foot you want to avoid if you’ve done something bad.