Scotland, 11th century. Driven by the twisted prophecy of three witches and the ruthless ambition of his wife, warlord Macbeth, bold and brave, but also weak and hesitant, betrays his good king and his brothers in arms and sinks into the bloody mud of a path with no return, sown with crime and suspicion.

On their way home from the Isle of Wight Pop Festival, Jeff, Trev and Mick along with girlfriends Marty and Cathy decide to pitch a tent on private land. In the morning the land's owner Rafe turns up and orders them to get off his lawn but changes his mind when one of the girls emerges naked from the tent. Rafe explains he only comes down to the house at weekends and lets them stay providing they redecorate his house. The squatters agree but once Rafe leaves they plot to organize a pop festival at the house. Attempting to raise cash for the venture, the men coerce their girlfriends into making a blue movie. When this proves disastrous Jeff goes to London and poses as a pop journalist in order to book the groups "Crazy Mabel" and "The Juicy Lucy" for the festival.