Thank you all,
Insanitybeard, it is indeed that exact movement. And so I guess my only other question, which would seem to have also been answered by your replies, is that this does not affect weather sealing? (just to confirm)
I would like to also point out that ... (as you can imagine), a lot of research was carried out prior to this purchase. And so I was surprised when I opened the box, to discover an included centre-pinch cap as opposed to the vilified edge-pinch - therefore perfect for those who prefer to keep their hoods attached.