Specific diet? Fly with another airline.
Do no fly with them if you have a specific dietary requirement. Flying UK>Beijing> Tokyo and there is only Beef or Chicken meals on board. Eventhough I've been talking to them two weeks before departure to add in a specific meal to meet my dietary requirement, I was told on many times after pushing back "sorry you'll have to being your own food for the 11hr flight". On their website there's the option to book many special meals, but after buying the tickets they dont actually let you choose a meal that meets special dietary requirements.