You're on a bloody good wage now and good on you. Here's the thing, what's next? Is sky the limit (excuse the pun) salary wise or will you eventually come back to the UK/EU and get stuck with tax etc? Meanwhile, it can take 5 maybe, 10 years to get "back" to that but hopefully it'll be a far more interesting ride. Once experienced, there's the bizjet world.
There's plenty of stuff online about aptitude tests etc. Worth looking at to get a handle on these tests.
Medical wise? Any issues? Thinking eyesight, hearing, diabetes etc?
Otherwise, if your goal is to fly, squirrel as much money away as you can so you're not crippled with servicing ridiculous debt. By all means, go for the TUI scholarship and have another crack at other tagged schemes.
If it all goes pear shaped, (medical or recession) at least you'll have "something" to fall back on - although, how long you can stay away from QS and be employable only you know.
Good luck.