In Windsor Castle
This was a non-standard post utilising a converted coal cellar below the state apartments at Windsor Castle. There was a concealed BPI pipe on the lawn fronting the apartments and a GZI mounting on the Brunswick Tower. According to the castle superintendent any evidence of the post was cleared away after the fire when the room was refurbished and put to another use. A visit to the room and photography was not allowed.
Closed in 1991.