CREATE TABLE table_name_25 (northumberland_senior_benevolent_bowl VARCHAR(255), northumberland_minor_cup VARCHAR(255))
Who won the Northumberland Senior Benevolent Bowl, when the Northumberland Minor Cup was won by Whitley Bay 'a'?
    
SQL: SELECT northumberland_senior_benevolent_bowl FROM table_name_25 WHERE northumberland_minor_cup = "whitley bay 'a'"