You know I have always wondered whether there might be some sort of legal case against easyJet for their recruitment policy
Why?
Unless they discriminate on the basis of race, age, gender, or sexual orientation, what exactly would your "case" be? Discrimination is not illegal, unless it falls into a small range of categories. In fact discrimination is a good thing. It is what stops you killing or injuring yourself in numerous ways every day of your life.
Employers "discriminate" so that find what they hope will be the best people for the job. Provided they avoid any of the illegal forms of discrimination, they can employ who they like and as they see fit. If that isn't you or your mate, tough luck. Try someone else. Just as they can discriminate, so can you.