CREATE TABLE table_23414 ("No. overall" TEXT, "No. in series" FLOAT, "Family/families" TEXT, "Location ( s ) " TEXT, "Original air date" TEXT)

Name the air date for uk17
SELECT "Original air date" FROM table_23414 WHERE "No. overall" = 'UK17'
SELECT "Original air date" FROM "table_23414" WHERE "No. overall" = 'UK17'