Hi Joe,
Unfortunately I don't have any fixings to look at! At some point all of the fasteners have been removed and it was (badly) fixed with stick on velcro strips...I see why, replacing the alloy spare wheel in the boot well puts a lot of weight on the trim panel and this has probably broken all of the retaining fasteners. It's the upper fasteners that I'm not sure about, the bottom ones are just normal fir tree types I think.
Nick.