The above images are what the scene looks like at the moment. I've included ambient and area lights with low intensity. Maybe a little too dark but its trial and error now but its what I've settled on at the moment. I've changed the main wall lights to a more realistic colour and you can just about see the boxes under the stairs. I've added some tables in the opposite corner (top image) as it was looking bare. A light in the 'control room' over-looking the scene has been added so you can see inside it but thats all for now.......Looking goooooooood!!