In reply to minimike:
You're fine - travel into Scotland is allowed from the rest of the UK, and travel within Scotland is allowed as long as you stay out of any level 3 or 4 areas:
https://www.gov.scot/publications/coronavirus-covid-19-guidance-on-travel-a...
It's not enforced, but you're asked to take a lateral flow test before travelling to the isles (a free one that you should arrange yourself).
Obviously there's a risk an area could get moved up to level 3 or 4, which could change things for you, but that's just a matter of luck, really.