It's there, I just checked to make sure I had the right page number (27). CP cites as proof of the marriage this fine:
" Pardon to Robert Hilton kt., son of William de Hilton kt., in that he and Maud, late his wife, da. of Maud, Lady of Clifford, had acquired, Without licence to them and their heirs male, two parts of the manor of Great Usworth and the manor of Bedick [by the enfeolfment of I3 Apr. 21 Ric. II] : and licence for him to hold the premises, in fee. (Durbam C/Jancery Roll, no. 42, m. 17). "