This is a really important question, and the short answer is that while a zero-hours employer has no obligation to offer you any particular number of shifts, stopping or reducing your shifts because you raised a complaint can be unlawful depending on what you complained about and how the situation is characterised.
Legal position:
On the face of it, a zero-hours contract means the employer is not obliged to offer work and you are not obliged to accept it. This gives the employer significant flexibility. However, that flexibility is not unlimited, and the law provides several protections that can apply even to zero-hours workers.
Detriment for making a complaint:
If your complaint related to certain protected matters, withdrawing shifts could amount to an unlawful detriment. The main categories where this protection applies include the following.
1. Whistleblowing. If you made a qualifying disclosure under Part IVA of the Employment Rights Act 1996, for example reporting a health and safety concern, a legal obligation being breached, or a criminal offence, you are protected against any detriment, which would include having your shifts removed or reduced. This protection applies from day one of your engagement, regardless of your employment status.
2. Health and safety complaints. If you raised concerns about unsafe working conditions, section 44 of the Employment Rights Act 1996 protects you from detriment.
3. Asserting a statutory right. Under section 104 of the Employment Rights Act 1996, if you complained about, for example, not receiving the national minimum wage, holiday pay, or rest breaks, and shifts were then withdrawn, that can amount to an unlawful detriment or, if it effectively ends your engagement, an automatically unfair dismissal.
4. Discrimination. If the complaint you raised related to discrimination, harassment, or victimisation under the Equality Act 2010, and shifts were then withdrawn, that is likely to constitute victimisation under section 27 of the Equality Act 2010. This applies regardless of length of service.
5. Trade union activities. If the complaint related to trade union membership or activities, protections under the Trade Union and Labour Relations (Consolidation) Act 1992 may apply.
The question of dismissal:
If shifts are permanently withdrawn so that you are effectively no longer engaged at all, this may amount to a dismissal in substance, even if no formal dismissal letter is issued. Tribunals can look at the reality of the situation. If you have two years' qualifying service, you could bring an ordinary unfair dismissal claim. If the reason for the dismissal falls into one of the automatically unfair categories listed above, no minimum service requirement applies.
Worker status matters:
Even if you are not technically an employee, most of these protections extend to workers. Zero-hours workers are still workers for the purposes of the Employment Rights Act 1996 and the Equality Act 2010.
Practical considerations:
The difficulty with zero-hours arrangements is evidential. The employer will often say there simply were no shifts available, or that work dried up. To counter this you should think about the following steps.
1. Keep a detailed record of the shifts you were offered before you made the complaint and the pattern afterwards. Dates, times, and any communications are all valuable.
2. Note whether other workers who did not complain continued to receive shifts at the same or similar levels.
3. Save all written communications, including text messages, WhatsApp messages, emails, rotas, and app notifications, as these can demonstrate the change in pattern.
4. If the employer has said anything, even informally, linking the reduction in shifts to your complaint, record that as soon as possible.
5. Consider raising a formal grievance in writing. This creates a paper trail and also satisfies the requirement under the ACAS Code of Practice to attempt internal resolution before bringing an employment tribunal claim.
6. Contact ACAS early conciliation if you are considering a tribunal claim. You must do this before issuing proceedings, and time limits are strict, generally three months less one day from the act complained of, though early conciliation can pause the clock.
Recent developments:
The Employment Rights Bill currently progressing through Parliament proposes significant changes to zero-hours contracts, including rights to guaranteed hours and protections against one-sided flexibility. These provisions are not yet in force, but it is worth being aware that the landscape is shifting in favour of greater protection for zero-hours workers.
Summary:
An employer on a zero-hours contract cannot lawfully withdraw shifts as a punishment for raising complaints that fall within a protected category. The legal protections are real and do not depend on length of service in many cases. The challenge is usually proving the connection between the complaint and the loss of shifts, which is why careful evidence gathering from the outset is so important.
If you can tell me more about what your complaint related to and the timeline of events, I can give you a more specific assessment of where you stand.
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