British film set in mansion

I am looking for a film, it’s British probably 70s, possibly 80s, in colour.

From what I remember there are four people, two men and two women. I think two are brother and sister. They are in a mansion and there is a fire, the fire could’ve been some kind of portal or there is maybe some kind of spirit.

There could’ve been a maid or butler there too. That’s about as much as I remember. Not alot to go on but if anyone could identify it that would be good.

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