As you probably know (and will see when you get yours from Scotland), they tighten onto a rubber gasket and there is zero chance of them getting stuck unless they are cross threaded.
If you are going to get one of these stuck then you should not be opening your bonnet in the first place, leave it shut and take it to the garage when the red light comes on!.
Anyway the spoiler worked and the group buy is off, mine (as I think most people who liked the look of them) are on the way individually.
Just not worth the hassle.
Yeah my thoughts exactly, even a bonnet dodger like me couldn't **** it up.... I hope
I will post a pic of my caps when I get them