Usworth, pillbox and observation post

Discovered by a 'Derelict Places' member. Two concrete structures on a hill overlooking RAF Usworth (now Nissan). Both are covered with earth/soil maybe when the nearby covered reservoir was built on Nanny Cow Hill. One of the structures has its entrance in the roof so is likely to be an observation post rather than a pill box. The pill box is a bit further down the hill. Only the gun embrasure is now visible.