Sir William Mainwaring Brown is leading a campaign against permissiveness. To counter this, a group of hippies abduct Barry Ovis, a young parliamentarian who is about to marry his political agent, and take him, drugged, to a wild party. He escapes after clouting two policemen during a raid and takes refuge in Sir William's flat. He finds the great man is far from unpermissive himself. The pleasant evening of dalliance Sir William has arranged is upset by complications caused mainly by a police inspector and a member of the Opposition. The frenzy culminates in a whirlwind of panic stricken plans and counter plans as all concerned attempt to ward off discovery.