Green’s Dictionary of Slang

reggie and ronnie n.

[rhy. sl. = johnny n.1 (13); ult. UK gangsters Reggie Kray (1933–2000) and his brother Ronnie (1933–95); they offered ‘protection’]

a condom.

[UK]R. Puxley Cockney Rabbit.
[UK]Indep. Rev. 1 Oct. 5: ‘Curses,’ he said. ‘I’ve no Reggie and Ronnies about my person.’.