From Wikipedia:
The BT Tower is a grade II listed communications tower in Fitzrovia, London, England, owned by BT Group. It has also been known as the GPO Tower, the Post Office Tower, and the Telecom Tower. The main structure is 581 feet (177 m) high, with aerial rigging bringing the total height to 620 feet (189 m).
Upon completion in 1964, it was the tallest structure in London and remained so until 1980. Butlins managed a revolving restaurant in the tower from 1966 until 1971. […]
