WWII Service Record Abbreviations

Help! New to this forum!
Have just received the Army Service Record that is covered in abbreviations. Can anyone help me out with them?
1. C.T.A. H.Q.R.A
2. Forfeits 1 days pay under R.W. for WOAS see 15(1) A.A.
3. C.R.O.A
4. U/A/L/Bdr & P/A/L/Bdr
5. Granted S.P.P
6. C.P.O.A
7. C.T.B.A
Many thanks in advance,
4. U/A/L/Bdr & P/A/L/Bdr

Unpaid Acting Lance Bombardier & Paid Acting Lance Bombardier. (I think)
As for the rest, I have no idea.
A.A. is "Army Act" (I think). King's Regulations (at that time).
In exactly what conext do these abbreviations occur?

C.P.O.A might be a Command Post Officer's Assistant - if this is a training record and he is a Lance Bombardier. Thats the bright chap who actually does the artillery command post calculations which the CPO then checks.
Thanks Pteranadon. This is a Service Record of my partner's late father, who served WWII with 85th Field/Mountain Regiment R.A. (T.A.). Your suggestion could well be correct as under Qualifications it states - Signaller and C.P.O.A. Shortly afterwards he was granted S.P.P., which we now believe to be Special Proficiency Pay - awarded to those who undertook extra duties due to their special abilities.
Once again, thank-you very much for your help.

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