The Wills signal box. More accurately a ground frame hut. Although it's not anywhere near a copy, I've diddled with the windows to suggest the styling of the Corris examples and added a couple of internal details such as seating. Just a bit of weathering to do.
These little Wills packs are ideal for those who want a couple of evenings modelling and fancy a bit of kit bashing for under a fiver. I don't know why I didn't play with them sooner.