In spite of the above fact, there is no presumptionthat a particular person or class of persons is governed bycustom, and a party who is alleged to be governed by ... custom-ary law must prove that he is so governed and must alsoprove the existence of the custom set up by him. (See DayaRam v. Sohel Singh and Others, 110 P R. (1906) 390 at 410; Abdul Hussein Khan v. Bibi Song Dero, L.R. 45 I.A. 10).