27.—(1) While the court is deliberating on—
(a)finding, or
(b)any other matter as respects which the judge advocate directs that this paragraph is to apply,
no other person may be present.
(2) While the court is deliberating on—
(a)punishment,
(b)an issue of fact being tried under rule 84, or
(c)any other matter as respects which the judge advocate directs that this paragraph is to apply,
no other person may be present except a person in attendance for instruction.