Official Secrets Act
GCHQ will be a prohibited place under the terms of the OSA. Even if the Police aren't allowed to reveal that you are in a prohibited place there will be signs all round the perimeter fence saying this anyway.
GCHQ will be a prohibited place under the terms of the OSA. Even if the Police aren't allowed to reveal that you are in a prohibited place there will be signs all round the perimeter fence saying this anyway.