I just did a search for you in the London Beth Dine Kashrut....
website
London Beth Din Kashrut Kosher food in london
the list it gives is as follows
Cambridge Diet (Slimmers Foods) Banana Dairy
Cambridge Diet (Slimmers Foods) Broccoli & Cheese Not Kosher
Cambridge Diet (Slimmers Foods) Butterscotch Dairy
Cambridge Diet (Slimmers Foods) Cappuccino Dairy
Cambridge Diet (Slimmers Foods) Chicken & Mushroom Not Kosher
Cambridge Diet (Slimmers Foods) Chocolate Dairy Cambridge Diet (Slimmers Foods) Chocolate Mint Dairy
Cambridge Diet (Slimmers Foods) Forest Fruit Dairy
Cambridge Diet (Slimmers Foods) Lactose Free Cappuccino Parev
Cambridge Diet (Slimmers Foods) Lactose Free Chocolate Dairy
Cambridge Diet (Slimmers Foods) Lactose Free Mushroom Parev
Cambridge Diet (Slimmers Foods) Lactose Free Vanilla Parev
Cambridge Diet (Slimmers Foods) Leek & Potato Not Kosher
Cambridge Diet (Slimmers Foods) Oriental Chilli Dairy
Cambridge Diet (Slimmers Foods) Spicy Tomato Dairy
Cambridge Diet (Slimmers Foods) Strawberry Dairy
Cambridge Diet (Slimmers Foods) Toffee & Walnut Dairy
Cambridge Diet (Slimmers Foods) Vanilla Dairy Cambridge Diet (Slimmers Foods) Vegetable Dairy
Hope that helps