According to the British Dragonfly Society there are 3 dragonfly species that live only in Scotland: the Northern Damselfly (which looks like the one I identified as the common blue in my last post so I will have to investigate further), the Azure Hawker and the Northern Emerald.
I only had my phone camera to hand so my photos are not great. I don't think either of these creatures are indigenous to Scotland but they were lovely to see.
From my photographs I think I have seen the Common Darter and the Common Hawker but this will need to be confirmed.