Been Off Work?
You do not require a doctor’s sickness certificate for any illness lasting seven days or less. Your employer may however require you to complete a self-certification form (SC2) which is available from your employer, the HMRC website or to download from this website.
If you are sick for more than 7 days, your employer can ask you to give them some form of medical evidence to support payments of Statutory Sick Pay (SSP).
Statement of Fitness for Work – “Fit Note” or “Sick Note”
For more information see the DirectGov website (where the information was sourced).