2 months ago, PEK - LHR, F fare, no IFE for the whole journey due to a screen problem (and both F and J were full), got 15K compensation automatically. It really annoyed me that IFE did not work, especially you were supposed to stay awake to min jet lag impact later! i ended up with about 15 magzines and 5 different newspapers given by the crew. Life is too short and it is not worth the energy to fight for more.