There is heavy traffic at the Dartford Tunnel due to a succession of breakdowns.

The left-hand tunnel has been blocked at least four times this morning, starting with a broken down bus at 7am.

It has led to severe delays on the M25 Dartford Tunnel anticlockwise between junction 1A / A226 (Erith/Swanscombe) and junction 31 A1306 (West Thurrock).

There is also further congestion on the M25 junction 3 at the Swanley Interchange.