Cops failed to find gun used to murder colleague

A gunman shot dead a Met Police sergeant in a custody suite with an antique gun the victim’s colleagues had failed to find when they searched him, a court heard. Pol Sgt Matt Ratana, 54, died from a wound to the chest after Louis De Zoysa, 25, smuggled the revolver into the Windmill Custody Centre in Croydon, south London. The New Zealand-born officer was just two months away from retiring when he was gunned down in the early hours of…