which office holder's resting place is st giles' church and john jestyn llewellin as predecessor ?
SELECT DISTINCT var_uri where brack_open var_uri dbp_restingPlace dbr_St_Giles'_Church,_Horsted_Keynes sep_dot var_uri dbp_predecessor dbr_John_Jestyn_Llewellin,_1st_Baron_Llewellin sep_dot var_uri a dbo_OfficeHolder brack_close