After a week-long break, September began with yet another National League victory, over Warwickshire, before their streak of four victories in a row was broken by Northamptonshire in a drawn game. As reigning Twenty20 Cup champions, they were invited to the , where they lost two matches and bowed out at the group stage. Two days later, they travelled up to Chester-le-Street, where a batting collapse led to a five-wicket defeat at the hands of Durham, and they also lost to Derbyshire in the Championship, the first team to do so in three years.