Any commissioner of oaths may, within the area for which he is a commissioner of oaths, administer an oath or affirmation to or take a solemn or attested declaration from any person: Provided that he shall not administer an oath or affirmation or take a solemn or attested declaration in respect of any matter in relation to which he is in terms of any regulation made under section ten prohibited from administering an oath or affirmation or taking a solemn or attested declaration, or if he has reason to believe that the person in question is unwilling to make an oath or affirmation or such a declaration.