based on my very vague memories, I will be so impressed.
I'm pretty sure it was shown in the last year (at least longer than 6 months ago), on terrestrial rather than streaming services. Had a good cast including quite a well-known older woman, and the plot was something to do with a close-knit family and one of the family members commits murder (maybe even of another family member?). I'm pretty sure it was just a straight drama, I seem to remember it got good reviews. Oh and it was British.
I'll be so impressed if anyone can identify it!(I can't, I want to try and watch it which is why I'm asking
)