CREATE TABLE table_17968 ("Round" FLOAT, "Circuit" TEXT, "Date" TEXT, "Length" TEXT, "Pole Position" TEXT, "GT3 Winner" TEXT, "GTC Winner" TEXT)

what is the maximum round for gt3 winner hector lester tim mullen and pole position of jonny cocker paul drayson
SELECT MAX("Round") FROM table_17968 WHERE "GT3 Winner" = 'Hector Lester Tim Mullen' AND "Pole Position" = 'Jonny Cocker Paul Drayson'
SELECT MAX("Round") FROM "table_17968" WHERE "GT3 Winner" = 'Hector Lester Tim Mullen' AND "Pole Position" = 'Jonny Cocker Paul Drayson'