It was a popular show here in Oz as well back in the 70's.I still remember the theme song.
R.I.P. Bill Pertwee
Pike, who foolishly opts to sing a song in which Hitler is called a “twerp” at that very moment (”Whistle while you work, Hitler is a twerp, he’s half barmy, so’s his army...”), finds his name also put on the U-Boat Captain’s List once Mainwaring inadvertently gives it to him (”Don’t tell him, Pike!”).
http://www.youtube.com/watch?v=0V3SqxUomwk
Classic,