Anybody know what this is? Its situated on the entrance path to our flats, although I presume its related to either the original factory on the site, or something used by the builders when it was redeveloped about 5 years ago. Its about 10 feet up the wall, and is about 18 inches high, with 'BT' marked on it.
I hope its not used any more as the cable has been mostly yanked out the bottom.