Uniqlo makes the best budget down jacket on the market and it's not a close competition. 90/10 down fill ratio, lightweight enough to pack into its own pocket for travel, and warm enough for British winters without being a statement piece. The windproof outer keeps wind chill at bay, it's machine washable which matters in daily use, and the colourways are clean enough to work with most wardrobes. Exceptional value that outperforms jackets at twice the price.
Arc'teryx makes gear for professional mountaineers and applies that knowledge to a jacket that works in genuinely wet conditions where down fails. The Atom LT uses Coreloft synthetic insulation — it maintains warmth even when damp, unlike down — with Torrent stretch panels under the arms for unrestricted movement. The quality is evident the moment you put it on: the zip pulls are solid, the seams are tight, and the fit is properly considered. Worth the premium for anyone who spends time outdoors in British weather.
The winter jacket for genuinely cold conditions — Canada Goose designed the Langford for Arctic and sub-Arctic temperatures and it shows. 625-fill duck down provides warmth-to-weight performance that synthetic insulation simply cannot match in dry conditions, the Arctic Tech shell has been tested at -25°C, and the coyote fur trim is functional rather than decorative, breaking wind before it reaches your face. Expensive, unambiguously, but it performs without question in conditions where cheaper jackets stop working.