Inventor John Green was murdered at his home in Poole. Dorest detectives need your help to find two men seen scuffling with him in the street. And who did he arrange to meet at a roadside cafe just days before his murder? If you can help, phone lines will be open on [number removed]from 9.00pm until midnight. If you witnessed an armed robbery would you be able to identify the robbers? At the start of Crime Prevention Week Crimewatch UK stages an armed robbery and tests three viewers on their observational powers. Could you do better?