Im sure they’re still there if you look but there used to be some off pisted steep drops from the edge of Adderstone field down to the lake. So if you did that as you arrived at Dixons Hollow and then ride the fire-road away from the car park at High Staindale then you’ll pick up the red again.
Or, once you get to Dixons Hollow, just jump onto the forest drive towards the mast at Red Dike on the map above. As the forest drive turns 90 degrees to the left, go straight on and you’ll pick up the red again just before the swoopy bit with the bombholes.
Or, as the forest drive turns left, you turn right and head down to the next T junction, turn left and then right and you’ll pick up the trail again as it crosses the fire-road somewhere near the old quarry.