Who was the radio commentator when the final television commentator was John Dunn? 
CREATE TABLE "commentators_and_spokespersons" (
  "year_s" real,
  "final_television_commentator" text,
  "radio_commentator" text,
  "spokesperson" text,
  "semi_final_television_commentator" text,
  "semi_final_second_television_commentator" text
);
SELECT "radio_commentator" FROM "commentators_and_spokespersons" WHERE "final_television_commentator"='John Dunn';