Good news, it looks like I have a 4 round light grill coming my way.
I removed the square ones this evening and in doing so I think I may have answered my own question.
Underneath the square headlight trim on the N/S the front of the wing is slightly damaged and dented. Its nothing much to worry about, some minor cosmetic work, however, that does mean that that trim and those headlights haven't been on there from day 1.
I now feel a lot happier about removing the square headlights and going back to the round ones.
It also means that it isn't a special edition as I was lead to believe.