Patients need to self certify for the first 7 days of sickness this can be done online, only after this can the Dr can extend the sick note, which can be backdated if necessary.
To request a sick note, please complete an online form.
For more information please see the following links
https://www.gov.uk/taking-sick-leave
https://www.nhs.uk/when-do-i-need-a-fit-note/
