CREATE TABLE table_22372 ("Episode" TEXT, "Broadcast date" TEXT, "Run time" TEXT, "Viewers  ( in millions ) " TEXT, "Archive" TEXT)

What is the broadcast date of the 16mm t/r episode?
SELECT "Broadcast date" FROM table_22372 WHERE "Archive" = '16mm t/r'
SELECT "Broadcast date" FROM "table_22372" WHERE "Archive" = '16mm t/r'