Looks decent.
Featherlight men's 800FP down jacket. Supreme warmth and incredibly low weight which stows away into its own pocket. 100% recycled nylon with a PFC-free DWR and RDS-certified down. Free delivery. Free returns.
alpkit.com
255g in medium seems OK, till you realise it doesn't have a hood. The trusty old Forclaz MT100 from Decathlon, has a hood, and even though it's also filled with 800 FP Down, its only 279g in Large, a mere 24g more. Just like the Alpkit it's stuffs away into one it's own pockets, plus it's a lot cheaper too...Only £59.99 vs £99.99.
Actually, there is an MT100 without a hood too, and when you compare pictures of the two side by side it would appear they are exactly the same product! Probably made in the same factory just badged differently...The extra double the price is just Alpkits markup over using Decathlons cheaper product but with their own label.