Can a contractual notice provision override the statutory minimum notice period?

Employers are free to provide contractual notice terms that are more generous than the statutory minimum. However, the statutory minimum notice would replace any shorter notice period provided for in the contract.

For example, if an employee's contract provides for a notice period of four weeks, the employee will be entitled to four weeks' notice until they accrue five years' service, at which point their statutory minimum entitlement will be five weeks' notice (increasing by one week per year up to a maximum of 12 weeks) and so will override the contractual entitlement.