CREATE TABLE table_4119 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

What is the original air date for episode graeme clifford directed and lindsay sturman wrote?
SELECT "Original air date" FROM table_4119 WHERE "Directed by" = 'Graeme Clifford' AND "Written by" = 'Lindsay Sturman'
SELECT "Original air date" FROM "table_4119" WHERE "Directed by" = 'Graeme Clifford' AND "Written by" = 'Lindsay Sturman'