You are a legend Rick - I managed to get it all rolling nicely this evening. The cut off edges were a result of using too small a preview box.
For a change I stretched each of the R, G and B frames first, the reduced halos in blue and green and combined. Such a difference!
I didn't manage to deal a with a blue halo around 1 star and so ended up with a purple halo. However the halo tool worked a treat on that too.
Here is a before and after shot - the key is to use the the different colour sliders to match the background.
I'm still fiddling with it - its all a learning experience - but its a big step forward for me.
I am a happy camper. Will post the revised image shortly
Pete
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