Thanks Jase
Thats what I call a really thorough answer. On the light pollution score - yep I'll go and find out the best way to subtract it out in PS. Theres always something new you can learn there.
On flats - I have no experience, so the info you've provided is teriffic. I've seen some pretty good T-shirt setups with instructions on the web so I may tackle one of those to start with.
The sky flat idea just sounded appealing (ie: less effort in my mind) but clearly theres a lot more to it.
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