Thank-you Adam, Hraban and Richard for your suggestions.
In the end it was remarkably simple:
\starttext
\definecollector[example]
\setcollector [example] {\externalfigure[cow][width=6cm,frame=off]}
\setcollector [example] [corner={right,bottom},location={right,top}]
{\rotate[rotation=90]{\copyright A great artist}}
\placefigure [ ] [fig:cow] {A fine figure of a cow}
{\composedcollector{example}}
\stoptext
In the above the cow is drawn with the figure caption below as normal and with
the copyright text running upwards along the edge of the right-hand edge of the
image. And if you want to fine tune the space between the image and the text
then it's easy to \framed the text and play around with the size and offsets.
—
Bruce Horrocks
Hampshire, UK
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