A photo shows the two pieces of lead piping lying on a bloodstained mailbag in which the body of nanny Sandra Rivett was hidden after the attack

Lord Lucan went on the run after nanny Sandra Rivett was bludgeoned to death and his estranged wife Veronica suffered serious head wounds in their Belgravia house.

The photo was found on Lord Lucan's bed in his London flat by police officers and taken away as evidence. The black and white image has never been published before