name the office holder whose predecessor is patrick buchan-hepburn and successor is tam dalyell ?
SELECT DISTINCT var_uri where brack_open var_uri dbp_predecessor dbr_Patrick_Buchan-Hepburn,_1st_Baron_Hailes sep_dot var_uri dbp_successor dbr_Tam_Dalyell sep_dot var_uri a dbo_OfficeHolder brack_close