Employees only need a Fit Note from a Doctor after 7 days off work sick and have the right to use their statutory holiday entitlement during their sickness (http://www.gov.uk/)
Fit Notes and proof of sickness
Employees must give their employer a doctor’s ‘fit note’ (introduced April 2010 - formerly sick note) if they are off ill for more than 7 days. Hospital doctors or GPs provide them. They can charge a fee if a fit note is asked for before the 7th day.
The fit note will say the employee is either ‘not fit for work’ or ‘may be fit for work’.
If it says the employee ‘may be fit for work’, employers should discuss any changes that might help the employee return to work (e.g. different hours or tasks). The employee must be treated as ‘not fit for work’ if there is no agreement on these changes.
Employers can take a copy of the Fit Note, the employee should keep the original.
Employers can also ask employees to fill in a form when they return to work to confirm they’ve been off sick for up to 7 days. This is called ‘self-certification’. Employers usually provide their own version of this form.
Download ‘Employee’s statement of sickness’ (PDF, 50KB)