Crimewatch appeal for information on Betty Yates' killer

Presenter Kirsty Young will give a studio appeal, urging the authors of the two anonymous letters to tell police what they know.

Detective Chief Inspector Neil Jamieson, who is leading the murder inquiry, said: “One piece of information could be all it takes to solve this case and I would urge anyone holding back from contacting us, for whatever reason, to pick up the phone."

He added: "It's crucial that anyone who has any idea of who was responsible for this terrible murder comes forward and gives us as much detail as possible. We recognise they might be reticent but they can speak to us in complete confidence and I would urge them to do so now.”