Thanks all, much appreciated.
Collimation - good point. I forgot to check this after moving the telescope out to the new property. Likely has been knocked out of alignment at least slightly during transit.
Exposure depth - 300s is convenient because I can do that unguided ... 600s I should do but will see if there's a guide star
Background clipped - yes, improvement there.
Stretched lots - yes. Although, almost all in curves. I find it impossible to not bloat the stars, not sure if it's processing I need to work on or just my optics. Things like the screen stretch function in PixInsight result in the same bloating.
So..... where to from here...
I'll check the collimation and see if I can do some 600s exposures. As for the RGB data, I'm at a loss of what to do with that, the results I have look so awful, and that might just be collimation and so throw-away data.
Thanks!
Roger.