as title says, from J23 onwards clockwise, not sure how far, but think its to J25.
traffic que forming as i went past, easily filterable,
TomTom live also reports another 5 incidents in this area so expect a build up and mega delays for most part of the day 
Just added:
and don’t forget there’s 5 miles of roadworks clockwise leading into J21 (M1 Interchange)
Story I got on this is that a car transporter went over last night killing the driver with a few others injured in other cars. Not sure how accurate this is, came from one of our drivers! Thoughts go out to his family.