lucid - thank you for that, it has fixed half of my problem! However, I am struggling to import the full Spriter project into c2 - when I try the character maps sprites are missing. As you can see from my example above, there are only 3 red sprites in the project, but for the character maps to function properly during run time the others should be imported as well. What did you do to enable the export of these extra sprites in your example? Thanks.
Edit: I suspect that I am missing something completely obvious here because you managed it. If I bake the character map to an entity (which creates an extra entity in Spriter) and then the import the scml into c2 then the import brings the extra sprite images as well so they become available during run time.
Edit 2. I guess that this is a public demonstration of my learning - I see that baking the character map to the entity is the way to go! If I do that then there is no problem here. I guess I have answered my own question.... Thanks for your great support!