What a superb documentary. Tristan has excelled with genuine information from a variety of sources. It is encouraging to hear that Easyjet are the first UK airline to consider installing filters. All the others are burying their heads in the sand with denials of the problem.... but I fear for not much longer. The writing is clearly on the wall - there needs to be more litigation against airlines and aircraft / engine manufacturers for producing and or operating in an unsafe manner. The truth is on every can of engine oil. With more litigation that will force the situation. DHL although cargo only have retro fitted clean air systems.I was surprised the French knew of this problem in the 50's and their military had engine oil to different specification - shock horror that even that oil is untested for toxic vapours etc. Well done Tristan I look forward to your next documentary.