I’ve asked our payroll consultant, Alan McEwen, to weigh in on this one. Will get back to you as soon as I hear from him.
Here’s Alan’s response. Feel free to follow up.
The answer depends on what these people’s contracts of employment were at the time of hire and when the person changed jobs. For example, if the offer letter incorporated the company policies by reference and stated the employer had the unilateral right to change these, then the employer would probably be able to limit its liability in the way expected.
This isn’t so much an employment standards issue as one of contract law, so without more details it’s little hard to give a more precise answer