Great classic film

[Cardnim]

Just watched a really interesting and pretty good old film called "The Stone Tape"
Its from 1972 and its made by the BBC.
As far as I can tell, its no longer available (I just got my VHS copy through eBay and they go for £20 upwards on DVD!)

Really interesting storyline, with strange script and brilliant synth music.
Its a kind of sci-fi / ghost story and is in some places very unsettling and disturbing, in some places scary, and in others just bizarre.

Bonkers and well worth a watch if you are into your film.

Now that Ive watched that.... anyone else got any suggestions for really good "lost" classics, horror, sci-fi ??
(...and without trying to sound up my own arse, assume Ive seen all the usual classics so we dont need to post about those. Im looking for different things we might not have heard of before. )