This is really good - Dirk Bogarde in a film about code-breaking written by Leo Marks), but is also by way of being a taster for the site it came from (which you can see the name of in the description): hundreds of films, from all over the world, all with hard subs and in small file sizes: better quality than Youtube but far from HD (a good many of them have never been released on dvd, or even (as in this case) on VHS). They are often side films, or at least not well-known: as the name of the site suggests: Rare...mms.com.
There is another site with almost the same name: with "Lust" where the first one is "Filmms". It sounds like a porn site, and it does have some old porn on it, but mostly it's good old stuff, mostly from the 60s and 70s, but a few earlier and later: there's quite a lot of Bob Hope and Norman Wisdom for some reason, but also a lot of Jess Franco and other heroes of Eurosploitation.
(I've not put the full names of the sites for obvious reasons. If I've done too much I'll take this down. But they're open sites and quite safe - no viruses, that I've come across at any rate.)