What are the possible consequences where an employer fails to respond to an employee's notification of their intended maternity leave?

An employer must respond to an employee's notification of their intended maternity leave within 28 days, informing the employee of the date on which their additional maternity leave will end. The consequences of a failure to respond will be that the employer cannot prevent the employee from returning at an earlier date or withhold their pay if they return early, nor can it discipline or dismiss the employee if they return later than the end of their 52 weeks' maternity leave.