Thanks guys for the comments and tips. We have tried some single frames at different ISOs to see the results but the background becomes very grainy with RAW images. That was why we stuck to 100, 200 ISO and jpg for this first stacking test. We'll give it another try at higher ISO with more images and see how it goes. It might take a while to get another go as the weather continues to be uncooperative!
Clare & Peter
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