Moment Colin Gunn told jury who convicted him 'thank you, you scumbags'

As series 4 of Murdertown, narrated by Silent Witness star Emilia Fox, is released on Sky, charting events leading up to the killings of John and Joan Stirland in their seaside chalet on the Lincolnshire coast, Legal Affairs Correspondent Rebecca Sherdley looks back on the case

A security 'ring of steel' guarded Birmingham Crown Court as one of the most feared gang bosses in Britain went on trial. On Colin Gunn's arrival to the courtroom via police escort from prison, a helicopter swirled overhead, and armed police guards were stationed at the door.

Visitors were quizzed about their interest in the case, where they were from, and names noted by police sentries to the courtroom. Mobile phones were surrendered and locked away, only returned on leaving.