CREATE TABLE table_31245 ("Episode" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "UK viewers  ( million ) " TEXT, "Share  ( % ) " TEXT, "Original air date" TEXT)

Who is the director when the share is 11.8?
SELECT "Directed by" FROM table_31245 WHERE "Share (%)" = '11.8'
SELECT "Directed by" FROM "table_31245" WHERE "Share (%)" = '11.8'