Richard O'Sullivan going to spill the beans a la Deep Throat (not Linda Lovelace).
Perhaps you should read Dennis Waterman's gripping autobiography ReMinder. Dennis and Richard O'Sullivan are old chums, having attended Corona Academy drama school when teenagers. Long before the Sweeney (actually only a year before the Sweeney) and Minder, O'Sullivan got Dennis a role in an episode of Man About The House, playing an arrogant German who spanks George Roper's bottom for mentioning the war.
As Dennis laments in ReMinder, O'Sullivan has these days become a bit of an alcoholic manic depressive. So any beans he spills should be taken with a grain of salt and a squirt of kecap manis.