Below are the sites to check regarding Scotland’s requirements due to COVID-19. Please check these frequently as they will change over time.
https://www.gov.scot/coronavirus-covid-19/
https://www.gov.scot/publications/coronavirus-covid-19-international-travel-quarantine/
https://www.gov.uk/uk-border-control
https://www.visitscotland.com/about/practical-information/covid-19-recovery-phases/