I think as a non-scholar with good grades in the civil service, there are a few programs which you can try to get your bosses' recommendations to attend them.

1) Postgraduate sponsorship. For those who miss out on undergraduate scholarships as an A'Level leaver.

2) High Potential Program. Though not quite on par with MA or AO scheme, it sure is the stepping stone for more things to come.

3) Senior Command and Staff course (for uniformed groups). Grooming you to become a superscale officer.

If you have all 3 in your bag, congratulations to you!