British Pathe have a lovely range of newsreels showing Christmas times in the Navy from 1914 to the 1940s – which mostly seem to consist of making Christmas puddings and drinking rum. To view a few of them click on the following links:
Naval Barracks aka Christmas Dinner and Rum in the Navy (British Pathe, 1914)
Naval Christmas Devonport (British Pathe, 1919)
Christmas in the Navy HMS Hood (British Pathe, 1922)
Christmas with the Navy (British Pathe, 1940)
Xmas aboard a Cruiser (British Pathe, 1940)