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 or you can download it here from our website. If your employer insists on a doctor’s certificate for the first seven days of an illness, despite the lack of legal requirement, then we can issue a private sick certificate for which a standard charge applies.
It is up to your employer to decide whether you are incapable of work. A medical certificate, now called a ‘Statement of Fitness for Work’ from your doctor can be used as evidence that you are unwell/fit for some aspects of your role, and would normally be accepted.
You could also provide evidence from a hospital or someone who is not a medical practitioner, e.g. a dentist or a physiotherapist. Your employer will decide whether or not this evidence is acceptable. If your employer has any doubts, they may still ask for a ‘Statement of Fitness for Work’ from your GP.
For more information see the DirectGov website