Sorry for the delayed replies, and also for the lack of details. The central white part is reverse, so it's the outer red section I was referring to. There's definitely a reflector in there, but there are around 6 darker sections which, to me, look like an area for lights of some kind; perhaps LEDs.
I put the fogs on at what point but these weren't seen by my mum behind.
I'll have a good play around next time I'm with the car.