In reply to accidentalclimber:
I was given a Rab Positron for Christmas. It's super toasty warm and lovely, and is a bit longer than some of the other options, which is good for keeping your bum warm. Excellent for loitering at the bottom of a crag, and has a two-way zip which is useful should you find yourself belaying in chilly conditions https://www.outside.co.uk/womens-clothing/womens-jackets/womens-down-jacket...
The other option was the Mountain Equipment Senja, which is good value for the amount of warmth and, like the Positron, is also a bit longer than some other jackets. But the fit wasn't quite right on me due to my bum / bust proportions. If it had fit me, I'd have got it. https://www.outside.co.uk/womens-clothing/womens-jackets/womens-down-jacket...
Looking at the specs, the Rab Neutrino probably sits somewhere between these two in terms of warmth and weight, but looks slightly shorter so less bum coverage. I didn't try it on because the shop where OH works doesn't stock it
My old jacket was a Neutrino, but actually a mens small - when I bought it nearly 15 years ago I think Rab's womens' sizing was a bit off and the men's small fitted better than the womens'. But it has got tired, holey, and lost some of its warmth.