For the benefit of this ignorant Yankee on the other side of the pond, what occupies the rectangle on the far-left side of the bar under the exhaust?
'Can't quite make it out...or figure it out on my own! ;-)
I can't 'blow it up' any at all w/o blurring it even more.
On my screen it looks like an oval-shapped piece of opaque white plastic...so its SHAPE certainly would be consistant with your theory.
I didn't notice its lack of screws until you pointed it out!
To the left of the exhaust is a reversing light to the right is a fog light and in the centre is a grey ford logo on the alloy background thanks for the likes.