By Lucy Thornton & Bradley Jolly The gang behind a robbery which left a rookie police officer dead went on an alcohol-fuelled night out at a brothel hours before the murder. PC Sharon Beshenivsky, 38, was murdered by Piran Ditta Khan, who also “orchestrated” the robbery at Universal Express Travel in Bradford, West Yorkshire, where the attack happened. Khan, 75, was also found guilty of two counts of possession of a firearm with intent to endanger life, relating to the same incident in November 2005. Six other men – part of Khan’s gang – have since been found guilty of offences including murde…