I found it, in the end - date-taken and a bit of examination of the calendar. I should probably make greater use of albums.
This might be useful occasionally (if you have the original flickr filename, which, of course, uploading to Microco.sm obscures):
https://www.bram.us/2008/01/12/my-priceless-flickr-tip-how-to-find-the-original-flickr-photo-url-and-user-from-a-static-flickr-image-url/
@Dammit started
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I found it, in the end - date-taken and a bit of examination of the calendar. I should probably make greater use of albums.