I came back from a long journey the other day to find that my headlight wash cover thing has decided to jump off somewhere on my travels.
The advertisement for the car showed this one missing but when I went to view it had been replaced, the plastic attachment looks intact but I'm guessing there's something wrong.

Any idea where to get hold of a painted replacement in the UK and what the cost will be?

Also; is there any way of making sure they stay on?