The generation gap is one of those issues that obsessed the British in the 1960s and 70s; popular sitcoms from Till Death Us Do Part to Bless This House, reveal an unhealthy interest in what the young were up to and scenes of comic generational conflict.

Comedy and horror are never far apart - they both probe the cultural fault lines of the day - so it's not surprising that some of the British horror movies of the time reveal similar anxieties about 'the youth of today'.

Tony Tenser, head of Tigon Films, produced a pair of bona fide classics of British horror with Witchfinder General and Blood On Satan's Claw.