The chief peace negotiator for Colombia’s Farc guerrilla movement has given the clearest signal yet that the group’s near half-century left-wing insurgency is drawing to a close. In his radio interview Mr Márquez said that as part of its peace strategy the group had been looking at other peace processes, including Northern Ireland’s. “We have met with the Irish, with the IRA, and they there found a formula which has to be analysed very closely,” he said.