On 30 July, the body of a man in his late 30s was found on a waste tip in Surrey. He had been stabbed three times. His clothes, wallet and rings had been removed but his tattoos helped police identify him. He was 37-year-old George Leitch from south London, who had been reported missing by his family four weeks earlier. Tonight's programme reconstructs the events surrounding his disappearance and murder in the hope that new information will emerge.

Police also need to catch a rapist who attacked and robbed a woman in London on 16 August; and they are also seeking the gang leader in an armed robbery at a Hull factory in late July.

Why would anyone want to kill family man John Reynolds? He lived in Rushden, Northamptonshire, and was gunned down early in the morning on Monday 18 October as he walked his dog in a quiet country lane. His death is still a mystery, but perhaps you hold the vital clue to his killing. Police urgently need to trace the motorcyclist seen at the scene moments after the murder. Maybe you've seen the distinctive motorcycle before, or can recognise the man who rode it?

In Shropshire, two security guards were attacked and subjected to a terrifying ordeal as they tried to make a delivery on 21 September. Police need your help to identify four men they believe were involved in the raid. Locals recall seeing strangers in the town about a month before the attack, and Crimewatch has impressions of their faces and descriptions of their getaway cars in the hope you might remember something.