Altogether there were 2 screws, and 2 bolts. The bolts bolted in from inside the tailgate into the spoiler, which sort of had the nut sunk into it.(it did look like a 'out of the factory') And the screw were of a similar story without the sunken brass nut.
I will hopefully get out some time this week to give her a good clean, after a 300 mile round trip to southampton, this week, so will take some pictures and try and work out how to upload them on here!