If an organisation adopts a flexible working time system, any extra hours worked on top of normal contractual hours may be added to the employee's flexi-time record.
In most cases, once a number of flexi-hours have been built up, the employee can request to have that amount of time off as paid holiday.
There is usually a limit to the amount of flexi-time that can be built up weekly or monthly and these limits should be set out in the organisation's guidelines and flexible working policy.
It is important to keep adequate flexi-time systems in place which ensure that the organisation can keep control of the scheme and make it easy to understand for all staff.