Pete Walker's 'Frightmare' is a gloriously gory mix of psychopathic and cannibalistic killings and pretty English cottages, all topped with all those naff '70's fashions, haircuts and British cars.
Walker regular Sheila Keith is the woman sent to an asylum fifteen years ago, along with her abetting husband. He's helpless when her cravings come back and assumed cured, she now reads tarot cards. Their daughter gets romantically involved with a young psychiatrist and when her younger, adopted sister starts going off the rails, the young doctor naturally wants to help.
She's actually helping find feeding matter - and their brains - for her step mother. And step mother uses an array of everyday tools and appliances to get to her subjects' juicy bits. Electric drills, pitchforks, you name it. There's plenty of reasonable looking blood at the right times and some great make up effects of everyday folk with half their heads missing.
Now, nearly forty years on it's more a chiller than a screamer but very effective nonetheless and certainly one of the better Brit horror flicks I've seen.