Related Rule
United Kingdom of Great Britain and Northern Ireland
Practice Relating to Rule 100. Fair Trial Guarantees
Section L. Advising convicted persons of available remedies and of their time-limits
The UK Military Manual (1958) states: “Every prisoner of war …must be fully informed of this right [of appeal or petition] and also of any time limit for appeal or petition.” 
United Kingdom, The Law of War on Land being Part III of the Manual of Military Law, The War Office, HMSO, 1958, § 232.
The UK LOAC Manual (2004) states in its chapter on the protection of civilians in the hands of a party to the conflict:
In the case of penal offences relating to the armed conflict, the basic principles of natural justice must be observed … These principles include the following: … a convicted person shall be advised on conviction of his judicial and other remedies and of the time-limits within which they may be exercised. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 9.6.
With regard to prisoners of war, the manual states: “Every prisoner of war must be given the same rights of petition and appeal against finding and sentence as members of the armed forces of the detaining power and must be fully informed of those rights and of any time limits.” 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 8.141.
Lastly, in its discussion on the administration of criminal law in occupied territory, the manual states:
Although a convicted person has no specific right of appeal under the law of armed conflict, a right of appeal may exist under the law applied by the court. Even where that law makes no provision for appeal, the convicted person has a right to petition the competent authority of the occupying power in respect of finding and sentence. He must be fully informed of his rights of appeal and of any time limits within which he must present his appeal or petition. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 11.70 11 .