Thanks Guys,
I think the colours might be a bit misleading. They don't quite
match up on different pieces of the mosaic for one thing
and on another night I get different hues

When I do a colour correction on the final mosaic to daylight 6500K
I get a warm overall brown change to a more 'realistic' grey I am
used to

Anyway, here is a result from this morning when my son decided to
join me in the dome at 3am.
You always miss a bit don't ya?
Edit: a saturation tweak on right.
Steve