One thing I've noticed is the gantry immediately south of Haydock J23 looks wrong. The four boxes left for the signals above each lane look far too much to the left. You can't really see it on my photos, but at this location, there is a maintenance depot or something that is just off the motorway and a short slip road for service vehicles to enter and exit. So - prior to the roadworks - there were four lanes plus hard shoulder here (three running lanes, the slip road, and the hard shoulder). But they seem to have put the gantry to start over what was the slip road. So a space to the left (where the old slip road hard shoulder was), then four lanes, and another lane left empty on the right!
Perhaps the plan is to slew all four lanes over to the left, and just leave dead space near the central reservation, although why they'd do that I'm unsure? Or have they just messed up!?
Here's two pictures from a recent journey and a streetview of the old layout.