Detectives are seeking a key witness as part of an investigation in to an alleged historic sexual assault.
Officers are trying to find a man called Richard Bradbury who lived in Leicester and attended New Parks boys school in the 1970s when he would have been around 10 to 12-years-old.
They are stressing that Mr Bradbury is not a suspect but he could help the investigation.
Detective Constable Rebecca Horsfall from the specialist Signal team said: "We have written to all the Richard Bradburys on the electoral roll who fit the age bracket, we have also tried the Schools Archive Records Office and police recording systems.
"However we haven't been successful in locating him. We have to stress that Mr Bradbury isn't a suspect and there's nothing to suggest he witnessed any kind of assault but the only details that we have are his name, former school and that he would currently be in his forties.
"We're urging people, if they know a Richard Bradbury who went to New Parks Boys' School in the seventies, if they know where he is or where he might be, then we'd encourage them to contact us. We also need to stress that the assault is not in any way connected to the school.
"We thought long and hard before doing this appeal. We had to weigh up the possible shock to all Richard Bradburys that they could have information about a potential crime against the need to progress the investigation. We have to apologise if in doing this we create any stress or unwanted attention to any Mr Bradbury.
"However, we felt we had to try all options to properly investigate this assault."
Anyone who thinks they may be able to help is asked to call 101 and when prompted key in DC Rebecca Horsfall's identification number 4606. Alternatively you can call Crimestoppers anonymously on 0800 555111.
