bt tower london, formerly the post office tower….  the main structure is 177 metres, with a further section of aerial rigging bringing the total height to 189 metres….  In 1962, while still under construction, the bt tower overtook st paul's cathedral to become the tallest building in london….a title it held until 1980, when it was overtaken by the natwest tower….  the tower was commissioned by the general post office (gpo)…..its primary purpose was to support the microwave aerials then used to carry telecommunications traffic from london to the rest of the country, as part of the british telecom microwave network….  the bt tower was given grade II listed building status in 2003….several of the defunct antennas located on the building could not be removed as they were protected by this listing….  however permission for the removal of the defunct antennas was approved on safety grounds as they were in a bad state of repair and its fixings were no longer secure…. as of december 2011 the last of the antennas has been removed, leaving the core of the tower visible….
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