Thanks to Moley for giving me the heads up about the entire District Line being suspended earlier due to faulty communications equipment. Must have been some fault for the whole line to have come down. You'll also find your journey effected if travelling on the Hammermith & City Line as that's currently suspended between Liverpool Street and Barking and the Circle Line is also suspended in both directions between Edgware Road and Aldgate (via Embankment) due to faulty communications equipment.
Hopefully, they might have fixed all of this by your journey home, (keep an eye on the real time delays site) if not have fun! If anyone has any more news on what's behind the problems please let us know in the comments. Cheers.