Thank you, Lemira, for raising this topic. I am not vegan/veggie but I have leanings that way as I detest cruelty, and if vegetarian/vegan dishes were more imaginative, I am sure many omnivores would choose your options, particularly knowing that most meat the airline industry uses in Britain comes from halal sources.
We have a chef, Richard, in the staff canteen in the Engineering Building at work and, whenever he's on duty, we have some very imaginative "taste sensation" meat-free dishes. I'll see if I can photograph some examples in the hope that it inspires those responsible for airline catering at BA to become more creative too!
When I was on an Army Landing craft years and years ago, the Army Catering Corps trainee chef was as keen as mustard to try out new ideas - many cooks have a burning desire to try to create and craft something a bit different. Cooking is an art form if you have someone who has a genuine interest in it!