Thanks for your replies!
http://img133.imagevenue.com/loc69/th_03801_views.JPG
I picked up a pencil and did a small drawing of what I saw when looking through the (left side) sight tube/cheshire and (right) collimation cap.
The crosshair reflections stack on top of the reflected centre spot and on top of the spider vanes. This looks good - what doesn't look good is the area around the reflected centre of the Cheshire and of the reflected collimation cap - should it not be perfectly round? The drawings are a bit exaggerated but the area is definitely not circular: it grows elliptical (?) towards the upper right edge of the view.