Have you ever thought about getting a job in the industry after your a-levels, it will allow you to gain a large amount of experience and knowledge that could be useful at interviews for cadet programs? Worked for me.
You can't really get an enjoyable/good/well paying job straight after A levels.
But I agree that it is a possibility, to which I haven't given much thought yet.
How did it work for you? What are you doing at the moment ?