We have just been told that we are being posted to Benson in Feb. We have a 5 year old girl and 12 year old boy. Because of his shift patterns (and up-coming training away from home, and postings to Bastion) we are going to have to get an au pair so that I can still work. I am told that we are only eligible for a 3 bed. Does this change if we need live in child care? Are there any 4 bed at Benson? How do I approach this and who do I talk to?