I take it you're not a scholarship holder (no offence, neither am I). Promotions aren't straightforward in the civil service. At MX11A AD level, your supervisors (whether deputy director or director) would have signalled to you if there were plans to promote you.

This then kicks into a gear ways to boost you throughout the year for promotion, such as giving you the more important(-sounding) pieces to work on. It's reverse engineering and promotions are not given for just doing your work well.

Unfortunately, a lot depends on whether you're in good favour as well as the make-up of your division. Older staff (meaning 40s onwards) will know that as good grades are already reserved for younger staff and scholarship holders, there is little or nothing left unless your director has taken a shine to you (have also found that deputy directors' views can be easily overridden by the director, so of course best to be on good terms with all supervisors, but focus on your director if that's possible).