In case you have missed it, major industrial action is taking place on the London Underground at present.
Only three London Underground Lines are working: Jubilee, Northern and Piccadilly (though the Piccadilly is a bit dodgy in West/ North West London).
All other London Underground Lines (including the Central Line) are suspended. The industrial Action is due to finish at 18:00 on Thursday 6th September, though a normal service is not expected to resume until Friday morning.
The Docklands Light Railway is unaffected and all National Rail Services are similarly NOT affected by the industrial action.
Real time information is available here, via the tfl website.