On Saturday 1 August, guests at a wedding reception found the body of 15-year-old schoolgirl Helen Gorrie. She had been strangled. The previous evening a witness thought she saw Helen talking to two men. Will you recognise the videofit of one of them? Did you see anything unusual that night along the old A3 in Horndean?

In Milton Keynes, a number of attacks, including two rapes, have taken place this year. Nearly all the incidents took place around the Fishermead Estate and police believe one man is responsible. Have you have seen anything suspicious?

Among the appeals featured tonight is a crime that took place in Frinton-on-Sea on Thursday 27 August. A Post Office van was making a routine delivery when the guards were attacked by armed robbers. Police believe four men were involved and are anxious to trace a white Sierra Sapphire and a black J-reg Alfa Romeo. Both cars followed the van until it was abandoned in a nightclub car park about seven miles away. Crimewatch UK will be showing two artists' impressions of the hijackers and reconstructing events in the hope that a viewer might remember where the cars went next.