Rustlers beware

I've got used to the tired, and probably inaccurate, signs on white vans: "No tools left in this vehicle overnight." And the bizarre, tautological invitation stuck on the back of some security waggons: "Police follow this vehicle."

But the prize for the most surprising, not to say intriguing, goes to this, seen near Glastonbury today: "No ponies are kept in this lorry overnight."