Oh, England. Not much snow or studded tires? They both add to the sweat factor for winter riding. One of my studded tires weighs like 950 grams, and is like riding though wet tar, not much coasting. Snow, 'nuff said. Back to my jacket, Windproof front on a lightweight running jacket, plus wool base layer and thicker wool sweater, varies by temps. Some of just sweat more. Even at 20 F.