The British Film Council have upload British Propaganda Films from the 1940's. These should make a really interesting watch, and I think there's about 100 of them in total.
The Land of Invention is the only one I've look at so far, but I'll certainly be getting involved in the others when I get a chance. Props to Elbows at Urban75 for the share.
Land of Invention (1941) from British Council Film on Vimeo.