Shift patterns are often central to people’s lives — childcare, second jobs, health. Whether your employer can change them depends on what your contract says.
Contract Terms vs Flexibility Clauses
| Contract says | What employer can do |
|---|---|
| Specific shift times stated | Cannot change without agreement |
| Broad hours clause (e.g. “up to 40hrs/week, various shifts”) | More flexibility with reasonable notice |
| Express flexibility clause | Can vary within stated limits, reasonably |
| No hours specified at all | Weaker protections; implied terms apply |
Working Under Protest
If shifts are changed without consent and you cannot refuse:
- Continue working the new shifts to protect your income
- Send a written objection: “I am working these shifts under protest and do not accept this as a variation to my contract”
- Raise a formal grievance in parallel
- Seek advice from ACAS or your union
Working the new shifts without objecting for more than a few weeks risks being found to have accepted the change by conduct.
Constructive Dismissal Risk
If the shift change is severe (for example, moving from days to permanent nights), you refuse to work it, and the employer dismisses you — or if the change fundamentally breaches mutual trust and confidence — you may have a constructive dismissal claim. You need 2+ years’ service, and you must resign promptly after the breach (not months later). Take advice before resigning.
Special Situations
- Caring responsibilities: a shift change that makes childcare impossible may give rise to a flexible working request and/or indirect sex discrimination claim
- Disability: if you have a medical condition requiring day working, a night shift change may require reasonable adjustment
- TUPE: if your business transferred, the new employer cannot impose significant shift changes as a result of the transfer
What to Do If You Object
If your employer announces a shift change you cannot accommodate:
- Put your objection in writing — notify HR or your manager in writing that you cannot work the new pattern, giving specific reasons (childcare, transport, second job, health)
- Request a flexible working meeting — if the change relates to hours and you need a different arrangement, make a formal flexible working request alongside your objection
- Raise a grievance — if the employer insists on the change without agreement and there is no contractual power to do so, raise a formal grievance
- Take legal advice — if your employer refuses to negotiate and the new pattern significantly impacts you, consult ACAS or a solicitor about your options including constructive dismissal if you resign
If you continue working the new shift under protest, ensure you have communicated your protest in writing — working the new shift without objection may be treated as implied acceptance of the contractual change.