A murder case is never completely closed until an arrest is made. Tonight police reveal their current investigation into a crime which happened 20 years ago. Two girls, Barbara Mayo and Jackie Ansell-Lamb, were murdered near the M1 and M6 after hitch-hiking north. With viewers' help, officers believe they can now solve the case and close their files at last.

Detectives want to trace all taxi driver Steve Johnson 's passengers in Stoke-on-Trent on the evening of Friday 21 December. One of them decided to kill him. Perhaps you were shopping in Cheltenham on Wednesday 30 January? If so, you may have seen a gunman and his accomplice. And Maria Requina from Manchester was murdered only weeks after talking on TV about the dangers of street life.