Post Office Tower

The Post Office Tower, later known as the BT Tower, was a large tower in London designed to carry telecommunications traffic to the rest of England.

History
It officially opened in 1966. That year, the self-aware computer WOTAN occupied the top of the Tower and directed preparations for C-Day, its robot War Machines, and mind controlled human slaves from there. (TV: The War Machines)

Later in that year, with WOTAN defeated, Igrix the Kustollon left his spacecraft there. As the Ninth Doctor raced to get to Igrix's ship, unknown to both parties he passed his first incarnation's companions Ben Jackson and Polly Wright, both visiting the Tower. Both companions had had involvement in the C-Day affair. (COMIC: The Love Invasion)

At some point during the 20th century, the Post Office Tower was said by Sarah Jane Smith to be the tallest building in London. (COMIC: Invasion of the Scorpion Men)

In 2009, Rani Chandra believed that the strange lights that had been seen around the BT Tower were not lightning bolts, as reported in the Ealing Echo, but an alien spacecraft. However, Sarah Jane Smith had Mr Smith investigate and he determined that it was in fact lightning. (TV: The Mad Woman in the Attic)

By 2028, the WOTAN computer system was still located in the BT Tower. It was used by UNIT to monitor every other computer system in the world. (AUDIO: A Death in the Family)

Behind the scenes

 * The Post Office Tower is heavily mentioned in, and the unseen setting for the whole first portion of, the 1975 parodical TV story Hallo My Dalek, where the Doctor has parked the TARDIS on top of the Tower, to the irritation of Home Office.