I have 2 from Mountain warehouse which are very good.
The lightest packs down very small, so i use this when hiking as it packs into its self and i keep it along with my Berghaus waterproof over coat and pants in a backpack.
Its very warm and windproof and rated to -10c
The second as pretty bulky but rated to -35 something i am very unlikely to be in... if it gets that cold i am staying in with the central heating on lol
The next time i buy a down jacket i will get one that is also waterproof, as this is the only thing that lets the 2 above down.