No worries Philip, I just used the "Noise reduction" tool in PS, Gimp has a similar one (Filters/Enhance/Noise reduction) which seems to work well. To get the white balance, I used the AutoWB feature in PS and selected the polar cap. I don't know if there's a similar tool in Gimp.
Yep, still loving the 9.25", it's really brought me a lot of joy
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Andrew