If you're travelling into London on the Tube today, just expect it to be pretty crowded, particularly in the obvious places like TfL's poster says.
It's a Saturday service, but all stations including Westminster are open, although some of them may be temporarily closed if overcrowded. More details on TfL's site.
Peter Hendy, London's Transport Commissioner said "All Tube lines will be running and our bus and streets teams will be working flat-out to make sure that the closures and diversions needed are managed smoothly. The whole of TfL is focussed on helping to ensure that a great day is had by all."