Just to get your bearings, you can find a map of where the Tower is here, and an aerial photograph, here.
The panorama will open facing roughly south west, looking towards Battersea Park and Battersea Power Station.
Click here to download the 360 degree panorama of London... Remember folks, it is a 5MB .MOV file!
You can scroll around the image using a mouse, pressing "shift" to zoom in, and "ctrl" to zoom out. You may even see your intrepid phtographer reflected in one or two panes.
Now, for the IMAX release...
(Updated to make the QTVR movie a download link instead of an embedded image behind a cut tag, as LiveJournal strips the tags needed to manage QuickTime movies)