BT Tower in London

BT Tower

> BT Tower - still called the Post Office tower by some - was built in the 1960s as an aerial tower for microwave communications (no longer in use).

> Regarded as of strategic importance, information about the tower was designated an ‘official secret’ and even taking a photograph of it was discouraged.

> From ground-level to the aerial platform (1), behind the green tinted glass (2) there are rooms housing the communications equipment.

> Above the aerial platform is a viewing gallery and revolving restaurant (3) but this has been closed to the public since 1980 and is now only used for corporate entertainment. The restaurant made one revolution every 23 minutes.

> The lifts in the tower are some of the fastest in use, taking just over 20 seconds to reach the top.