An ex-military policeman hailed a hero for helping victims of the Manchester Arena terror attack has died following a road collision. Ex-serviceman Darron Coster used his training from 22 years in the Royal Military Police (RMP) to assist casualties in the City Room foyer where the bomb was detonated at the end of an Ariana Grande concert in May 2017. On Monday, Sir John Saunders, the chairman of the public inquiry into the attack, said they had received the “very sad news” that Coster died last week. “At the end of last week we had the very sad news that Darron Coster had died last Wednesday, July 14 following a road traffic collision,” Saunders said. Coster, who retired from the RMP in 2008, told the inquiry earlier this year he had served tours of Northern Ireland, so was familiar with the aftermath of bomb explosions and had basic first aid training. …