Just had all the boot lining studs out and removed the lining panel to look at how this mechanism is screwed into the boot metalwork. Need a large Torx by the look of it that I don't have. The fix looks to be simple enough if it occurs.
I did the open and close another couple of dozen times and all still fine. Hmmm, I may leave it and keep an eye on it. I just did it that once and it is on my mind now though. Boot light works fine as well.