Hi Richard, catch up time for me...
0 Old: cracking old camera and a wonderful ref background. Really like this as the detail is superb with the punch added with the background. You do need to get it flat though
1 Metal: again, a super composition and some lovely lighting on the object itself. Background is interesting and adds something which a simple backdrop wouldn't - really smart
2 Captive: another super shot and again, carefully chosen lighting. Smart capture and a great idea.
3 Miniature: A good composition but the graininess of the image detracts for me, as does the halo around the teapot. As others have said, not sure the colour cast works but it's always good to experiment.
4 Happy: A capture which works better (for me) if you know the subjects - you've said yourself, the light wasn't great and to my eyes it's not as sharp as it could be. A nice picture and perfectly on theme, but it doesn't possess the same wow factor as the first three.
5 Abandoned: I like the mini shot and don't mind the PPing at all. I think I prefer the colour version, but like both - great spot given you were on your way to shoot something else and I think you've done well to grab this in preference to the hospital