Floor space is a premium but there is a whole blank wall above the existing rad that would happily take a rack (or tall towel rad if a suitable side entry valve one exists).
You could always make your own rad to fit. It is simple and cheap. Here is one I did earlier:
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Bugger all surface area, you're not going to achieve much flux through that.
@Charlie_L started
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Floor space is a premium but there is a whole blank wall above the existing rad that would happily take a rack (or tall towel rad if a suitable side entry valve one exists).