When searching for Puppy Linux answers I have found this website to be most useful:
well minded puppy.com Using that site I found a number of entries regarding webcam usage. Hope this is helpful.
Thanks! Some progress following stuff on that website.
I now have GUVCViewer installed plus dependencies (I think) via PPM and recognising the camera (and the green light on the camera comes on!!). However, the preview image is black/blank whether Image or Video is selected.
Camera connected via a powered USB hub.
I've rebooted the Pi to see what that does - same.