The website is about five years old [ie. made about 1999], it was completed by a friend of mine just as a pass time. I do not support it or have time to amend it or update. I do not publicise any of my work or allow people in to the numerous [physical] sites I own, with the exception of the partnership programme my wife and I are involved in with English Heritage.
As for the police box at the Met sports ground, this is actually a copy of an original box and not a very good copy at that.
I (to my knowledge) own all remaining Mark I Gilbert McKenzie Trench design Police Signal boxes. The only original police boxes the Met Police have are on loan from me.
We also loan boxes to various other English forces and museums, more than we loan to Scottish Forces or museums so I am disappointed you think there is a Scottish slant.