Thank you. The contract could indeed allow the employer to potentially change your shift pattern but they should still consult with you over the proposed changes and give you sufficient notice before the changes are implemented.
Also, if your pay will be affected they should at least try and minimise the potential effects of that by finding the most favourable solution that has the smallest negative impact.
If you wanted to challenge them, the following options are available to employees to challenge these actions:
1. If the employer forces the changes through, the employee can start working on the new terms, then write to the employer making it clear that this is done ‘under protest’. This means that they do not agree with the changes but feel forced to do it as they have no other option. In the meantime, they should try and resolve the issue by raising a formal grievance with the employer. This is only a short-term solution though as the longer someone works under the terms, even under protest, the more likely it is that they will eventually be deemed to have accepted them.
2. If the employer gives notice to terminate the current contract and re-engages the employee under a one, it could potentially amount to unfair dismissal. However, the employer can try and justify their actions if they had a sound business reason for doing so, usually from an urgent financial perspective. If no such reason exists, it is possible to make a claim for unfair dismissal in the employment tribunal, subject to having at least 2 years’ continuous service with that employer. This would be on the grounds that there has technically been a dismissal because the original contract was terminated by the employer.
3. If the changes fundamentally impact the contract, for example changes to pay, duties, place of work, etc., it is also possible to resign and claim constructive dismissal. The employee must accept the changes and immediately resign in response to them. A claim is again dependent on the employee having at least 2 years' continuous service with the employer.
Does this answer your query?