There's an interesting article here: http://www.smguariento.com/take-an-uneasy-ride-british-theatrical-horror-shorts-1976-83-by-sim-branaghan/
Particularly useful is the list of A-films that the shorts originally accompanied.
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I've seen very few of them, or at least I don't remember them even though I saw quite a few of the main features on original release. I think I only ever saw the Stanley Long ones in the Screamtime compilation. Although wild horses could not have dragged me to see Saturday Night Fever, I think I saw Panic at the cinema but I have no idea what it might have accompanied. Sredni Vashtar was also excellent.
I have dim memories of a (long-ish, I think) short that doesn't seem to appear here. All I can really remember of it is that at least part of it was set in the country and there's a scene where a chicken has its neck wrung but it doesn't die, just goes around with a stretched neck. I hadn't yet gone veggie but I found it very disturbing. I think there might have been an implication that such a fate would befall one of our characters. Does that ring a bell with anyone? Might it have been The Cottage? I definitely saw Poltergeist at the cinema so there's a fair chance I saw that short.