After a walk on Hampstead Heath, what better way to refuel than with cake and a cuppa. Louis Patisserie is a Hungarian cafe, founded by immigrant Louis Permayer in 1963. And it hasn't really changed since. The patterned carpet, the panel walls, and the leather chairs take you back in time and to Eastern Europe, but with classically English teacups. With a range of tea, and an even bigger range of cakes and pastries, it's cosy and unique and the perfect spot to warm up after a wintery walk . . .