Ah, one of my favourite junctions.... Not. I have often used this one, from the M42 N (i.e. east bound at this point), and I use Forshaw Heath Road (FHR) - as do many others as the new M42 "improvements" mean stationary traffic back to J2. I would say the Ree.t was lucky to be able to go left at all from L2!
Let me explain. The slip road off the M42 used to split into 3 lanes at the roundabout, but as part of a set of "improvements" they added traffic lights to the roundabout, and reduced the 3 down to 2. Now I don't have a problem with the lights as the traffic approaches from high speed from all directions (except FHR), and 40 mph+ was common.
With 3 lanes it was relatively clear where people were going even when not indicating: L1 means A435N, L2 means A435N or FHR, and L3 means A435S. Now with two lanes and no other instructions I have assumed that L2 means FHR and A435S with L1 A435N - when you look at the map it is effectively a DC left and a DC around the roundabout, so I think Left means Left, Right means Right.
Unfortunately I appear to be in a minority, as significant number of other people pretend the A435N doesn't exist, so they use L1 when meaning FHR. As you have to be in the left lane on the roundabout to take FHR this means both L1 and L2 trying to get into a single lane, and both thinking that they have priority - if there are two or three in L1 and they move together it is impossible to get into the left lane and coupled with the daily queues on the M42 tempers get frayed. I have been involved in a verbal shouting match with other drivers about it, and they are convinced that L1 with no indicators obviously means FHR while L2 means A435S.
This is a primarily a consequence of the change from 3 to 2 lanes and an absence of signs or other guidance. FHR is a small country road, and doesn't really feature on any of the approach signs, so another consequence is that HGVs commonly take FHR rather than the M42N! And then want to turn around on a road that isn't designed for it. One space has been blocked as the house fence was demolished weekly, so they now use the junction slightly further up to do a 3 point turn, but even that isn't easy and the ground just off the road is typically soggy. It is tricky getting by when the cab unit has grounded itself in the mud with the wagon directly across the junction!
Anyway back to the point - I suggest that Ree.t doesn't use L2 to go North because my experience is that even if they are indicating left (may still be
from leaving the motorway) they are quite likely to be going straight on into FHR.
Google Satellite Image of junction