You only need a doctor’s note if you are unable to work and are ill for longer than seven calendar days.
Your employer will provide you with an SC2 self-certificate form for shorter periods of illness or you can download a form on the GOV.uk website.
You do not require any certificate for the first 4 days.
If you need a doctor’s note, please call in on a Friday at 12.00pm to book a sick line slot for the following week, these can be backdated for you.