So I've had a play and cant completely solve my issue. Described better by Maniac in a 2012 (!) post.
Yes thats the gap I'm talking about, mine was so close that when the boot lid swings back and up it scraped very slightly on the bumper making a creaking noise. 2mm is very close, like mine used to be so I'd suggest having someone open the roof/close the roof while you crouch and double check. Mines now some 4/5mm and when the lid moves it clears the bumper by 2/3mm... very close tolerances.
My lid def touches the bumper as it has scratched the paint work. I think raising the two latches as cerbera advised has now got it clearing that, but the horrid creaking noise remains. Any other ideas? Maniac is still on here, do you recall if raising the latch was the adjustment that resolved your issue or something else?