In reply to cubanallstar: The shop is in Helsinki where I live so probably not much help to you I'm afraid!
The DAS parka is excellent at what it is designed for - a full on over your goretex (or whatever) belay jacket. I've never used it temps above freezing, but having belayed mates at the bottom of still dripping icefalls I know that the outer material is water resistant and the insulation not too bothered by dampness - so for damp days at UK crags it would do the job, holding off drizzle etc. For a belay jacket whether for mountaineering or just UK cragging, I'd definitely look for something with a hood. My experience is that they make a huge difference even when not up as they still keep your neck and back of head warmer, something that wearing a beanie and then hoodless jacket doesn't necessarily do. I don't like detachable hoods, but that's better than nothing. Dedicated belay parkas (like the DAS) all tend to have the hood permanently attached. The downside of a DAS is that it is neither light nor small when packed. You need a reasonable amount of room in your rucsac to take it with you.
Ultimately, for what you say you want the jacket for, the question is how much money have you got? If you can afford one it will do the job brilliantly (I take it you've seen them on offer at R&R?) BUT you might find a feather-filled puffa jacket at Asda, BHS or TKmaxx - or even at a market - that will do almost as good a job for what you want it for for less than a quarter of the price. It was -17.5 when I left for work this morning and most people at the train station were wearing exactly the same kind of winter coats that you would buy in the UK from a dept. store or where ever. Most coats can keep you warm at those temps for some time - what you pay for is it to be light (or light-ish with the DAS), good material and cut that works for climbing etc. So its all a money/performance compromise.