Today UA 935 LHR-LAX was cancelled due to a fairly spectacular hydraulics leak. Some part in the nose of the aircraft ruptured and drained the entire center hydraulic fluid tank onto the tarmac. They were unable to locate a replacement part at LHR (the BA equivalent was a bit too long). So a new part is being flown in overnight and the replacement flight is tomorrow. Unfortunately no attempts were made to reaccommodate Y fare or upgraded passengers (regardless of status). Only full fare F and C. We all got sent to Gatwick Sofitel in coaches. On the bright side, the premium cabins look a bit more spacious tomorrow but it were already not full due to a late swap to old configuration.