If you have been ill for 7 days or less you don’t need to see a Doctor. You can complete a Self-Certification form yourself. However some employers insist on a Doctor’s note regardless. A Doctors note under these circumstances involves a charge of £15.
Many employers have their own self-certification forms. If your employer doesn’t have its own form you can download the Self Certification Form. Please print it, fill it in and hand it in to your employer. You do not need to see a Doctor.
Attached is a copy of the form if you wish to print and complete
SC2 (2010) - Statutory Sick Pay (SSP) Employee's statement of sickness.pdf
or got to Ask your employer for Statutory Sick Pay - GOV.UK