kettle (on a hob), n. — Green’s Dictionary of Slang

kettle (on a hob) n.

[rhy. sl.]

1. one shilling (5p) [bob n.³ (2)].

1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1992		R. Puxley Cockney Rabbit.

2. a pet name for someone called Bob.

1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1992		R. Puxley Cockney Rabbit.