Mayfly, most of the protein drinks I've seen this side of the pond tend to be high in carbs. The ones I know of are Nutridiet and Allevo which are available here in Sweden in most grocery stores. There are others that you can get specifically at health food shops and they might be better suited to your needs. Most come as bars, meal replacement drinks or soups. Ask the person at the health food shop about protein shakes/ drinks and they might be able to steer you to a good choice.