Breakfast is definitely my favourite meal of the day (whenever I get to wake up early) and this in London was one of my best breakfasts EVER.
Two words: Nordic Bakery. Say no more. A bright and peaceful place that allows you to enjoy early morning pleasures such as the smell of freshly baked pastries and good coffee while you read your favourite book or magazine.
If you ever go to either of their two venues, do not hesitate to ask for a herring sandwich and a homemade Finnish cinnamon bun (they really won me when I saw they bake them themselves).