Were you following this thread on photoireland??
I hope their fee isn't much...
Now you do mostly fine art stuff, right, and I don't think fine art would be considered "commercial" but to be honest, I'm not sure on that. To resell as stock, yes, a property release always required.
Let me know what you find out. I'm off travelling (starting Monday) for the next two weeks but I'd be happy to try and call and find out the answer before I go, if you like.