Drivers are facing delays on the M25 following “concerns for someone” on the Dartford bridge. All Kent-bound traffic was temporarily held by police causing queues to stretch back five miles. Drivers had been halted from Junction 31, near Lakeside shopping centre in Essex, to Junction 1a A206, Dartford from around 12.45pm this afternoon. Congestion reached back to Junction 30 but traffic has since been released. Essex Police, who are dealing with the incident, opened up all four lanes again just before 1.30pm. They said: “We are currently responding to concerns for someone on the Dartford Cross…