Sealion "porn" - have you got this photo?

[sitalkes]

Thanks to the good people on this forum I have learnt that there is an absolute piece of Sealion "porn" that has not appeared in any book on the subject, despite being in plain view - a huge large-scale map of all the English defences and beach utility in the Cabinet War Rooms (the room with Churchill's bed in it). You can go there and photograph it yourself but unfortunately it's behind glass, you can't get close to it, and the vital south-east corner is obscured. Has anybody got a clear photo, or set of photos, of this map?