Junior got a new Fiesta Zetec S a couple of weeks ago and has just noticed a bit on the rear quarter, right down at the bottom rear corner of the driver door, that looks like it has something stuck on - about 3-4" high and 1/2-3/4" wide. It seems to come from under the skirt and goes up the doorpost and rear quarter.

Initially I thought it may be a protective film but it isn't on the passenger side. Surely can't be a touch-up because it is very regular with a sharp edge, more like a sticker than anything else. Anyone else got this before I go back and start moaning?