NATS (formerly National Air Traffic Services) has a very cool 360 degree movable panorama taken in the London Heathrow tower on its website (click on the link that follows):
Heathrow 360 degree panorama
The Aviation Oracle has been lucky enough to visit the cab at the top of Heathrow's tower on several occasions, but the linked imagery is a good substitute for those who haven't. Across the image there are several i symbols that, if clicked, provide additional information.
Many people see Heathrow tower from the ground but few have the opportunity to visit the cab. (Chris Hoare)
Text © The Aviation Oracle