The Chelsea Helicopter Port (better known as Heliport Chelsea) was a heliport in Chelsea which was ruined (PROSE: Doctor Who and the Dalek Invasion of Earth) by 2167. (PROSE: Lucifer Rising) The Daleks used it as an assembly point for human prisoners to be robotised, taking them about their flying saucers.
The rebels of London launched an attack on the heliport to save the First Doctor and Ian Chesterton, Dortmun hoping that this victory would inspire further attacks. Baker posed as a Roboman whilst other men pretended to be prisoners and David Campbell, Barbara Wright and Susan Foreman threw bombs at the Daleks which proved ineffective. The Doctor was ultimately able to escape, but the majority of the rebels were exterminated. (TV: The Dalek Invasion of Earth)