A street vendor, blowing enormous bubbles in Camden. The bubbles came in clumps, each one more than a foot across, too big to be perfectly spherical, but glistening with rainbow colours. Nobody paid much attention. The bubbles burst against passing cars or got punctured by raindrops. Then the rain set in for real and the crowds dispersed into shops and doorways. An afternoon of sunshine and violent showers, spent dodging from one bit of cover to another. The object of the expedition - to find churros, the elongated doughnuts with a caramel centre. Elusive in Spain last week, where the churrerias always seemed to be closed, but right where you want them on the Lock.