Thanks Andy, I think your suggestion is the best I can achieve.
I have 5 LC2s in the room plus 1 replacing a wall switch in a passageway which leads off the lounge. There on the wall I have some framed pictures/posters which I sometimes illuminate with spots as part of an overall light picture (lounge and passageway). Most of the time however I use a couple of light picures which do not include the passageway spots.
As I described in my original post when the light pictures are in use without the passage ones and I raise the dim level in my lounge with the arrow on the Beo4, the pasageway llights come on and begin to raise their level with the main ones.
Of course, switching back to the original light picture switches them off again.
I can't see a way around it, but it's not a great problem just a bit of an irritation that I hoped could be solved!
Thanks again.