Keg at Four Thieves, Battersea. Sweet chocolate milk aroma. Even when sitting on the table the light comes through - a dark cola brown. Scant white head. There is a coffee element or it but it's surprisingly sweet with a sour edge. Artificial sweeteners come to mind. Thick bodied. Creamy. A light fizz of soda carbonation. Astringent finish. Like a supermarket own brand version of Tiny Rebel Stay Puff. OK but suspect.