If you require a fitnote (MED3) to cover you while you are self isolating for 7 days due to your symptoms, or 14 days due to symptoms of someone in your household, you should download an isolation note from https://www.nhsinform.scot/self-help-guides/self-help-guide-coronavirus-covid-19
If you are in the very high risk group of patients who have been advised to shield for 12 weeks (e.g. organ transplant, certain cancers, severe respiratory disease), the letter you have received from the government will be sufficient evidence for your employer – no further fitnote is required.
If you are self isolating due another condition because you are vulnerable (e,g. over 70s, heart disease, diabetes, chronic liver or kidney disease), you should discuss your health concerns with your employer. Fitnotes will not be issued for this purpose.