Green’s Dictionary of Slang

hot cross bun phr.

on the run.

1960		J. Franklyn Dict. of Rhy. Sl.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1992		R. Puxley Cockney Rabbit.
2001		M. Coles Bible in Cockney 58: I’m on the hot-cross-bun from ’im.