Larry Buchanan, the filmmaker who has died aged 81, specialised in the niche market for what he called "guerrilla filmmaking" - truly dreadful B-movies with such names as Zontar, the Thing from Venus; Curse of the Swamp Creature; Naughty Dallas and Mars Needs Women, a film which reputedly features in every list of the worst movies ever made. But even this last title found a market, and reached its widest audiences in a version dubbed into Yiddish. Buchanan combined the roles of producer, director, screenwriter, editor and, where appropriate, voice-over narrator. He was unashamed, even proud, of tacky production values,...