 Arthur Ashton is a makeup man working for National Television (a parody of the BBC).During a visit to the local launderette, he meets Sid Gibson a shady pedlar who is trying to flog "Bonko," a brand of washing powder in the shape of a pill, but who can't afford to advertise on TV.The fairly clueless Arthur agrees to help him, and they manage to plug an advert for Bonko on National Television by interrupting the live feed.