It's not a stupid question at all - you should take the certificates to your ACLO for verification of their validity with regard academic content in lieu of A2 Levels by AIB.
One thing I would say is that if you are over Grade 5 on one or more instruments (Of the orchestral or marching variety)then you should seriously consider RM musician.
Fifteen weeks military training, followed by 2 years 8 months musician training by the top UK professors in music- you can then go on to take a BMus(Hons) Degree whilst in fulltime employment.
If you only play one instrument, they will take you from scratch to grade 8 in two years 8 months. The variety of music is as broad as your imagination from Military, Classical, Rock, Pop, Big Band and beyond.
You are also trained as a paramedic and can be deployed in the group force protection role (there are 36 RM Musicians serving in Afghanistan this year) or the Medical role.