Right to work/study in the UK without sponsorship would probably suggest it isn't open to EU/overseas applicants unless you have dual citizenship or something. Happy to be corrected.
Let's be honest, they'll fill their ranks with locals without breaking a sweat and until they encounter issues with low application numbers and/or lack of retention then I can't see the net being cast wider. I've long accepted that I won't be eligible to apply for the cadet scheme(s) of other national carriers. Quite rightly so if they can employ a citizen who more than meets the standard without having to go through the additional complexities of sponsorship, etc. Not what some people want to hear, but just my 2p worth.