You're clearly not lacking in the qualifications department; rudestuff put it well, with
As for your question - its not you, it's the system.
I'm sure that you'll have a high success rate with other schools, and if these aren't to your taste, modular is always welcoming.
I was disappointed to have not even made it to the
web interview phase for any scholarship I applied to (BA, TUI, Air League) despite having gained similar work experience, degree in aerospace engineering and published research in aviation safety.
The truth is that many flight schools have an "image" of the perfect student for their school, with a number of attributes which they prefer. They might want someone with a degree, they might want someone without; they may want someone with flight experience, they may want someone without. If you don't fit the picture of the applicants they want, then you're out of luck. There are so many applicants to high-tier flight schools, and they can pick and choose who they let spend their £££ with them.