You cannot be sacked or treated less fairly by your employer because you have:
- made, or proposed to make, an application to work flexibly under the statutory scheme; or
- made, or have said you intend to make, a complaint to an employment tribunal about your application to work flexibly; or
- referred to circumstances which could be sufficient to found a tribunal claim.
Unfair treatment can include harassment or denial of training or promotion opportunities. Sacking can include 'constructive dismissal', which means circumstances where you are entitled to resign as a result of the treatment you have suffered by your employer, and being unfairly selected for redundancy.
You do not need any service in order to bring a claim for unfair dismissal if you are dismissed for exercising your statutory right to ask to work flexibly. A dismissal for this reason would also be automatically unfair.