Before leaving the woods, leave the forest trail on your right and continue straight ahead (mountain bike trail markers 8 and 10) on a path lined with hedges. You will reach a road. Turn right and follow it for 50 metres, then turn left onto the track that descends towards the sanctuary. Follow it on the right and climb back up to the RD 40. Cross it and follow it to the left for 50 metres, then turn right onto a track in the middle of the fields. It leads to a new road, which you take to the left. At the first crossroads, turn right.