55.—(1) If he finds a prisoner guilty of an offence against discipline the governor may, subject to paragraph (2) and to rule 57, impose one or more of the following punishments:
(a)caution;
(b)forfeiture for a period not exceeding 42 days of any of the privileges under rule 8;
(c)exclusion from associated work for a period not exceeding 21 days;
(d)stoppage of or deduction from earnings for a period not exceeding 84 days and of an amount not exceeding 42 days earnings;
(e)cellular confinement for a period not exceeding 14 days;
(f)in the case of a short-term or long-term prisoner, an award of additional days not exceeding 42 days;
(g)in the case of a prisoner otherwise entitled to them, forfeiture for any period of the right, under rule 43(1), to have the articles there mentioned.
(2) An award of a caution shall not be combined with any other punishment for the same charge.
(3) If a prisoner is found guilty of more than one charge arising out of an incident, punishments under this rule may be ordered to run consecutively but, in the case of an award of additional days, the total period added shall not exceed 42 days and, in the case of an award of cellular confinement, the total period shall not exceed 14 days.
(4) In imposing a punishment under this rule, the governor shall take into account any guidelines that the Secretary of State may from time to time issue as to the level of punishment that should normally be imposed for a particular offence against discipline.