For a British "horror" film, set in the aftermath of the '60s, I think it's quite good. I have watched it only once, though, so perhaps it needs closer scrutiny.
I like the settings; very bleak and rustic. However, the situation lacks a little credibility and has a tendency to be a tad humourous, rather than scary. I mean, a plot about a young man being locked in the cellar of a house for many years.... At least, when we finally saw the poor blighter, he didn't turn out to be some hideous "blob" or a plastic alien! However, somehow I couldn't quite see an emmaciated, half starved man being quite so agile and able to savage what were probably quite "fit" army personnel. He was hardly a "beast" in the cellar; he looked more like a Belsen victim with hair. (With due reverence to those who were real Belsen victims).
Flora Robson dressing up as "daddy" was a bit too surreal for me.
I'm glad I have it in the collection and your discussion has prompted me to view it again, perhaps a little closer.
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