What is the # for the episode with viewing figures of 7.02 million ?
CREATE TABLE "table1_15026994_5" (
  "num" real,
  "episode" text,
  "writer" text,
  "director" text,
  "original_air_date" text,
  "viewing_figure" text
);
SELECT MAX("num") FROM "table1_15026994_5" WHERE "viewing_figure"='7.02 million';