(1) This section shall have effect where -

(a) an employer gives notice to an employee to terminate his contract of employment, and

(b) at a time within the obligatory period of that notice, the employee gives notice in writing to the employer to terminate the contract of employment on a date earlier than the date on which the employer's notice is due to expire.

(2) Subject to subsection (3), in the circumstances specified in subsection (1) the employee shall, for the purposes of this Part, be taken to be dismissed by his employer, and the date of dismissal in relation to that dismissal shall be the date on which the employee's notice expires.

(3) If, before the employee's notice is due to expire, the employer gives him notice in writing -

(a) requiring him to withdraw his notice terminating the contract of employment as mentioned in subsection (1) (b) and to continue in the employment until the date on which the employer's notice expires, and