Montane Prim gets good reviews, they had them in Go Outdoors for £87 with their 15% off promotion recently. Not sure if its still on though.
Rab Xenon is similar sort of thing, but more minimal and lighter.
Arc’Teryx Atom LT is a nice jacket but a lot pricier.
I recently got a Norrona Lofoten primaloft jacket 50% off on Snow & Rock’s eBay site. I’ve not tested it in the field yet but it’s stood up to a couple of pub missions admirably :D