CREATE TABLE table_1686 ("Episode" CLOB, "First broadcast" CLOB, "Graemes guest" CLOB, "Jeremys guest" CLOB, "Votes  ( % ) " CLOB)

what is the number of the episode where maria mcerlane where gramer guest
SELECT "Episode" FROM table_1686 WHERE "Graemes guest" = 'Maria McErlane'
SELECT "Episode" FROM "table_1686" WHERE "Graemes guest" = 'Maria McErlane'