I dont think they are allowed in tbh. Maybe somthing to do with the demo work going on.. (although I guess I've not seen them inside any of it since decommissioning stopped..) After we tripped a sensor 5 pickups turned up from the main road but they just did the usual 'secure the perimeter' move and sat there for 4 or 5 hours. All pointing in towards the building but never ventured in. One was litrally parked on the threshold looking down the main bay but we managed to sneak past them to get out yet again! Place is a proper challenge. Love it!