‘Severe’ delays on M1 after collision

There are “severe” tailbacks on the M1 northbound in Leicestershire this morning after a collision.
Commuters are being warned by National Highways that there are delays in excess of 90 minutes on the M1 northbound, due to the ongoing collision between Junction 20 (Lutterworth) and Junction 21 (near Leicester).
As of 8am this morning (January 21) there was approximately seven miles of congestion almost back to Junction 19.
Traffic has been released, but two (of three) lanes remain closed.