Sorry to keep chuntering away to myself (this is a one-man thread) but I thought I should answer your question about the cupmarks Paulus (as posted under 'Misc').
No, the cupmarks in your photo aren't now visible, nor are they mentioned on the plaque next to the stone. It looks like they were originally buried, so perhaps the logic was that they should remain buried (in concrete!?).
Does the 'buried cupmark' idea strike you as strange? It's not something I've come across before. Does it suggest that the stone was re-used from an older site? This is turning out to be quite an interesting stone.
Photos to follow (when I get out of the office).
K x