Our struts are fitted the right way up (whatever that is).
The thin bit is on the bottom with the cylinder at the top. It is a 2005 model and judging by all the other extras would guess they were original fitment.
The Riva site picture of a gas strut shows them the right way up too.[You must be registered and logged in to see this link.]
Unfortunately navver I would guess that even before age ruined my close up vision and most certainly now, I can deduce slightly less than bugger all from the illustration shown.
However I will happily take your testimony that Ian is now fitting the struts this way up. In times past that was not the way though and it has been a long running thread upon here that instructions always state to fit the opposite way to that done by Ian. For evidence I present pictures from page 5 of this thread of Vicky and Nicks Dark Blue Designer(?):[You must be registered and logged in to see this image.][You must be registered and logged in to see this image.]
Young navver not only is it my eyes failing me but also my memory. Read further down page 5 and you will see that I have used a larger version of your illustration and pondered on Ian reversing the mounting of the struts!