Dad's Army 1977 S09E03

Episode: Knights of Madness. As part of a fund-raising pageant the Home Guard decides to put on a patriotic version of St. George and the dragon, with the dragon representing Naziism. Mainwaring is St. George in a suit of armour that causes him no end of trouble but, come the big day, they discover that Hodges and the air raid wardens are also staging a tableau of George and the dragon, which leads to an inevitable fight.