TIME FLIES...

Horizon: How To Build A Time Machine, 9pm, BBC2

WHEN Professor Ronald Mallett was ten years old, his beloved father died of a heart attack at the age of 33. Soon after, Ron read The Time Machine by HG Wells and, ever since, he’s been obsessed by the idea of going back in time to warn his father of his impending death. Now has a blueprint for a machine that could help him do just that.