A contract of employment is a legal agreement between the
employer and the employee. It contains terms, either express
or implied, which cannot lawfully be changed or varied by
the employer without further agreement from the employee
(either individually or through the trade union). Many terms
of the contract are, of course varied from time to time, by
mutual consent.
For example, it is quite usual for pay to be varied, usually
increased, on a regular basis. In some cases the contract
may contain an express term permitting the employer to make
changes from time to time. These changes would need to be
reasonable. Where changes are made to your contract the law
requires employers to notify you of the change within one
month.
However, that does not change the fact that an unauthorised,
one-sided variation is a breach of the contract of
employment. If such a change is so fundamental that it goes
to the heart of the contract, it may justify the employee's
resignation in protest. Such a resignation, if justified,
would be a 'constructive dismissal'
This information came from
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