Secret Island, Martham
My family have lived in Martham for many generations and the local story about the secret airstrip here is that it was set up with lights etc to look like an airfield for the purpose of preventing the real airstrip, RAF Ludham, from being bombed during the war. It was to act as a decoy, with the intention that the Germans would bomb the 'fake' airstrip being as that would be the first they would see from the air. Not sure if this is correct but it makes sense.