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The reference for FC V858 is correct for Sarah Daniels, but Claudia appears not in this but in V878, in the final scene only- the rest of the tape is another girl, unlisted, named here 'Elise'. V848 is all Claudia.
The ACF title referred to, queried, as 'Single Sensations'? might be their Dirty Housewives 1, in which Claudia has two scenes. The final scene on this, confusingly credited to 'Samantha James' (i.e. not the one listed here), is the 'brunette with sharp nose' from Hard Cut 2.

Louise is definitely Claire Collins' 'friend' in VW20 (yes, I counted the moles).

Out of interest I had a look in some old catalogues. As you say j.j. Claudia has one scene in V878 not V858. An easy mistake to make i.e. 848, 858, 878.

Looking at the write up for V858 Sarah Daniels is joined by Mandy King as Becky.

.....yes, around the time FC used quite often to stick the odd les scene on their supposedly solo tapes- usually but not always mentioned in the catalogue notes.

Sarah and Mandy are both in V950, a les tape. I wonder if their scene in V858 is off this ?

It seems the "mixing & matching" that now goes on at FC started long ago.

No: a different scene, not found anywhere else AFAIK.