For more than three decades Gavin Moss served with Kent Police, rising through the ranks to head up some of the county’s most high-profile murder investigations. Ahead of his retirement last week, he sat down with reporter Rhys Griffiths to look back on a long and successful career and recall some of the biggest cases he has overseen… Seven days had passed since the discovery of the body of a dog walker bludgeoned to death in the east Kent countryside, and Gavin Moss was no closer to identifying the killer. The murder of 53-year-old serving PCSO and mother-of-two Julia James had shocked Kent P…