*Resolved* to anyone still needing help, the only help I can gvie is don't give up it's just a fiddly job. When you remove the two grommets and put your screwdriver inside the two holes it might feel like there nothing there to pop the light out but there is it's just very difficult to find. A friend of my dads came over and had it out within literally 10 seconds.

Note* Don't try and force the light out as the screwdriver will go straight through the light and you might end up braking the light fixture and potentially scratch the rear spoiler Good Luck