[*M*a*TT*H*ew*]

Thank you! I thought I was the only one who knew that. The 10 housemates could look outside the house on evictions; they could even step outside the door. The main problem was that in Bow, it had a public path, so anyone could come and enter, which is what happened in BB2.
The good thing about Elstree is that the house is built on a tank, and is a high level building with good security.