
House of Commons, Hansard, 1 April 1981, 04:30am, volume 2 col 448 http://hansard.millbanksystems.com/commons/1981/apr/01/saving-for-things-done-under-a-licence#S6CV0002P0_19810401_HOC_593
Skinner may have been alluding to a classic joke http://quoteinvestigator.com/2014/04/19/half-fools/.
1980s