Help, someone?

Can anyone please tell me if, how and where (online) I can follow up this footnote?:- G.E.C. Peerage, V, 116. Edward Grey and Elizabeth granted the manor [Kingston Lisle in Berkshire] for life to Humphrey Talbot in 1475 (Cal.Inq. p.m. Hen. VII, i, 3389, 40910). I've tried all my customary paths but can't actually get to either the Cockayne Complete Baronetage or the relevant Henry VII Cal.Inq. Any assistance will be appreciated. Sandra =^..^=