26. In any proceedings under Article 20 for an offence of consuming, or permitting the consumption of, intoxicating liquor in the premises of a registered club outside the permitted hours or a period authorised under Article 25, it shall be a defence for the club or person charged to prove that such liquor was supplied by a person residing on those premises for consumption by him or his guests bona fide entertained by him at his own expense and that it was consumed by such persons in a part of those premises reserved for the use of the person residing on the premises.