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There is a principle in employment law where terms may become implied into an employment contract by ‘custom and practice’. This makes them contractually binding even if they are not written down anywhere. This area of law is rather complex and it is usually only down to the courts to establish with certainty if something had become an implied term. Nevertheless, it does not prevent employees from directly raising this argument with their employers.
The basic requirement for implying terms is the presumed intention of the parties, in other words - did the employer and employee intend for the terms in question to be treated as contractual. In general, a practice would need to have been clearly communicated and consistently applied for a substantial period of time before it can be considered an implied contractual term. Therefore, something that is uncertain, not communicated properly, not been applied consistently or has just been around for a few months is unlikely to qualify.
Case law has suggested that the following are important factors when considering whether a term has become implied in a contract:
She may tell the employer that she believes the term or practice she is relying on has been implied into the contract through 'custom and practice' and see what they say. They could of course deny that and refuse to discuss the matter and if that is the case then she can only realistically challenge this through the following ways:
1. Start working on the new terms but making it clear in writing that she is working ‘under protest’. This means that she does not agree with the changes but feels forced to do so. In the meantime she should try and resolve the issue either by informal discussions or by raising a formal grievance.
2. If the changes fundamentally impact the contract, for example changes to pay, duties, place of work, etc., she may wish to consider resigning and claiming constructive dismissal. The resignation must be done without unreasonable delay so as not to give the impression that the changes had been accepted. The claim must be submitted in an employment tribunal within 3 months of resigning and is subject to having at least 2 years' continuous service. She would then seek compensation for loss of earnings resulting from the employer's actions.
3. If the employment is terminated and the employer offers re-engagement on the new terms that could potentially amount to unfair dismissal. However, the employer can try and justify the dismissal and the changes if they had a sound business reason for doing so. This could be pressing business needs requiring drastic changes for the company to survive. If no such reason exists, she can make a claim for unfair dismissal in an employment tribunal. The same time limit of 3 months to claim and the requirement to have 2 years' continuous would apply, but as mentioned it can only happen if the employer tries to force the changes through by dismiss her and terminating her current contract.
I hope this clarifies your position? If you could please quickly let me know that would be great, as it is important for us to keep track of customer satisfaction. Thank you