CREATE TABLE table_22569 ("Series episode" FLOAT, "Season episode" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Viewers  ( millions ) " TEXT)

What is the original air date of the episode directed by Ian Barry and written by Philip Dalkin?
SELECT "Original air date" FROM table_22569 WHERE "Directed by" = 'Ian Barry' AND "Written by" = 'Philip Dalkin'
SELECT "Original air date" FROM "table_22569" WHERE "Directed by" = 'Ian Barry' AND "Written by" = 'Philip Dalkin'