Police searching for former colleagues of murder victim

It is now two years since Mr Warburton's death. We are particularly keen to speak to anyone who was in the area at the time of the attack and who may have seen or heard anything suspicious.

We are also keen to speak to anyone who may have worked for him in the weeks or months leading up to his attack.

We appreciate that given the nature of the business Mr Warburton ran people may be concerned about coming forward. We would like to stress that any information will be treated in the strictest confidence.