If you have been sick for more than four days in a row, but less than seven, you can self–certify your illness using a SC2 form. You can obtain this form from your employer or by visiting the HMRC website. If you are unwell for more than four days you are advised to arrange an appointment to see a Doctor to assess your fitness to work.
Statement of Fitness for Work
The Doctor will provide you with a Statement of Fitness for Work (‘Fit Note’) if you are still not well enough to work. Your employer will most likely request this statement as evidence to support payment of Statutory Sick Pay (SSP).
Further information is available at the Direct.Gov website.