A thermal bodywarmer is cosy and ideal for the wide temperature ranges of British weather. Packs down small in a bag, to be pulled out when the chill comes.
Insulate your core from the elements with this extremely lightweight, packable thermal gilet. Packs away small when not needed, plus the fabric is water resistant and windproof. The shoulders are reinforced to handle even the heaviest of backpacks. At Vulpine we've nicknamed them 'The Gilet of Happiness', because they're so flipping cosy!