Ineligibility for membership of courts-martial
17. An officer shall not be eligible to be a member of a court-martial for the trial of an accused if—
(a)he serves under the command of—
(i)the higher authority who referred the case against the accused to the prosecuting authority;
(ii)the prosecuting authority; or
(iii)the court administration officer;
(b)he—
(i)has a general qualification within the meaning of section 71 of the Courts and Legal Services Act 1990;
(ii)is an advocate or a solicitor in Scotland;
(iii)is a member of the Bar of Northern Ireland or a solicitor of the Supreme Court of Northern Ireland;
(iv)has in any Commonwealth country rights and duties similar to those of a barrister or solicitor in England and Wales, and is subject to punishment or disability for breach of professional rules.