When I took some courses at the Central Saint Martins' main building, I discovered Yumchaa. I quickly became hooked on the tea called Coco Camden (or Camden Coco?). It's a black tea with coconut flakes, dark and white chocolate (I don't like white chocolate much but the flavour is very subtle) and other yummy stuff. Unfortunately this tea is sometimes hard to find. The shop in the picture is in Shoreditch.
PS. They also have delicious salmon bagels with cream cheese. Just so you know.