what is the maximum round for gt3 winner hector lester tim mullen and pole position of jonny cocker paul drayson
CREATE TABLE "calendar" (
  "round" real,
  "circuit" text,
  "date" text,
  "length" text,
  "pole_position" text,
  "gt3_winner" text,
  "gtc_winner" text
);
SELECT MAX("round") FROM "calendar" WHERE "gt3_winner"='Hector Lester Tim Mullen' AND "pole_position"='Jonny Cocker Paul Drayson';