The breach must be sufficiently serious to justify the employee resigning. A minor or trivial breach is not enough.
Breach of contract may be caused by a single incident. It may also happen where there are a series of acts or a course of conduct over time which cumulatively amount to a serious breach of contract.
Most constructive dismissal cases are concerned not with an explicit or express term of the employee’s contract but an implied term of some kind. Implied terms are those that exist in a contract but are not written into the contract.
In constructive dismissal cases the implied term that employees most often rely on is a term which creates an obligation of trust and confidence between the employer and the employee. It is well established that such a term is present in every employment contract. An employer can break this contractual term by, without reasonable and proper cause, acting in a way calculated or likely to destroy or seriously damage the relationship of trust and confidence between the employer and the employee.