Sick (fit) notes

If you’ve been off sick for more than 7 days

You only need a sick note from a doctor if you have been off longer than 7 days

To request a sick note:

If you’ve been off sick for 7 days or less

If you’re off work sick for 7 days or less, your employer should not ask for medical evidence that you’ve been ill. Instead, they can ask you to confirm that you’ve been ill. You can do this by filling in a form yourself when you return to work. We call this self-certification.

Please follow the link here to self certify :
https://www.gov.uk/government/publications/statutory-sick-pay-employees-statement-of-sickness-sc2

Find out more about sick notes on the NHS website.