CREATE TABLE table_1726 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

What was the original air date of this episode that was written by Debbie Sarjeant?
SELECT "Original air date" FROM table_1726 WHERE "Written by" = 'Debbie Sarjeant'
SELECT "Original air date" FROM "table_1726" WHERE "Written by" = 'Debbie Sarjeant'