Just rewatched this for the first time in about 30 years and it is every bit as good and bad as I remembered. It has so much going for it - some real heavyweight acting talent; fantastic settings and atmosphere; Judy Matheson at her most luminous in a substantial role; and, best of all, a really off-kilter story. The pieces are all there. Of course it often belies its low budget and while there are some great actors on display others may not be quite so top-drawer. But none of that reduces the enjoyment of Crucible of Terror. Like several other British horrors it succeeds because of its shortcomings rather than in spite of them. If you're a fan of the genre you owe yourself a viewing.