This final section comprises films of enlightenment, persuasion, comment and, for wartime audiences, of exhortation and reassurance. The field is potentially enormous, especially if we take into account those productions designed for in-house use only. Over the years, such training aids must add up to hundreds of titles in dozens of languages on scores of topics, many by now perfectly redundant: Introduction to the Correct Selection of Marine Paint (1947), Shipboard Sewage: Problems and Solutions (1960)... of interest now, assuming prints have survived the junking process, only to cinema historians and to devotees, should any exist, of the subjects being elucidated.

In fact, sooner or later everything turns into history, and although we have noted a few token instructionals, it's the historical dimension which predominates among the selection of titles which follows.

The majority were government-sponsored, and prints naturally tend to be held by such archives as The Imperial War Museum in London and The Library of Congress in Washington - rather than by the commercial companies concerned with marketing the entertainment films covered in the preceding sections. Even so, some of these 'official' pictures have been released for VCR home viewing at one time or another during the last couple of decades. That's one of the reasons why, for interested parties, browsing around car boot sales can be so engrossing.

Again, visitors are urged to tell us about any titles which they feel ought to be added.