LIVE updates as Dartford tunnel blocked by crash bringing traffic to standstill

A crash on the M25 at the Dartford Tunnel has caused a road closure and heavy traffic. The incident happened on the anticlockwise stretch between Junction 1A (Dartford) and Junction 31 (Lakeside/Purfleet). The right-hand tunnel is closed, but the left-hand tunnel, which has a height restriction of 4.8 metres, remains open to traffic. Drivers should expect delays in the area.