I spent ages trying to work out
how to get the thing out, with gentle pulling and prising,
but eventaully worked it out......
To remove the light cluster you need to prise off the plastic lens using a sharp tool (I used a knife) but be careful !
When the lens is off, you can see a few clips around the insides of the plastic module that you can unclip with a screwdriver.
I can't remember exactly where the fixings were located, but when the lens was off it was easy to see them.
I hope this helps...