Thanks for the comments.
It took me a while to manage to get an image from Deepsky stacker, memory overflow if I remember correctly, trying to stack too many images.
Image 4 is on the Isle of Skye, at The Storr, it was windy, but worth the walk at 2am (just after the full moon had set)
I think it helps to have either the Milky Way prominent or a recognisable constellation.
The problem here is getting a clear night, some appear clear, but there is very high cloud, or fog.
The last time I managed to get one was near Lymington, UK, in November and the lens misted over quite quickly.