Google Street View (check out few more in the area by panning.)
While roaming the London streets (Vinery Way) found this strange sight of vans covered with grass.
These belongs to UK based "Innocent Drinks" who make fruit drinks, smoothies, juice etc. The vans covered with artificial grass are meant for vending and delivery of their products and serve the purpose of not only advertisement but also as easy identification.
In addition to grass covered vehicles they also have some vans/cars painted with black and white spots of cows. These also have cow horns which "moos" on pressing of a button.
Source of info: Official Webpage of Innocent Drinks