Has Mat Bocking compromised "The Defense of the Realm" by taking a photograph of a sign forbidding him to take photographs of a sign forbidding him to take photographs?
Seriously though, there is an issue here. MOD sites are "verboten" for photography. TQ can't be finished without access to Foulness and other local islands. There are other areas in the UK similarly restricted. Can Geograhph recognise these squares. I suggest black with MOD in white in the middle.