Notting Hill Gate, from 452 bus, 18th February 2009

Although very close in time to the Valentine's Day glut, from its colour I'd guess that this is a random escape. I mean, who'd give a green balloon?

I was heading to work when I saw this, going around the west side of Hyde Park rather than the more usual east. Unusually I wasn't sat at the front of the bus, so had to leap forward and crouch between the occupants of the front seats to snap this. They looked at me bewildered for a fraction of a second, but this is London - no-one said a thing.