After your description Gavin, I was expecting a couple of blurry dots. But, save a little colour adjustment they're very good. All astro images need a bit of a touch up.
Depending on your GIMP installation, Fx-foundary on the top menu bar has a nice set of sharpen algorithms. The luminosity sharpen is a good choice.
There are also some enhancement tools accessible from the top menu bar that do a good subtle job of enhancing detail.
Default settings usually work quite well.
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