name the office holder with predecessor as william whitelaw and office in parliamentary secretary to the treasury ?
SELECT DISTINCT var_uri where brack_open var_uri dbp_predecessor dbr_William_Whitelaw,_1st_Viscount_Whitelaw sep_dot var_uri dbp_office dbr_Parliamentary_Secretary_to_the_Treasury sep_dot var_uri a dbo_OfficeHolder brack_close