21. After regulation 17 insert—
17A. Where—
(a)a new or expectant mother works at night; and
(b)a certificate from a registered medical practitioner or a registered midwife shows that it is necessary for her health or safety that she should not be at work for any period of such work identified in the certificate,
the hirer shall without delay inform the temporary work agency, who shall then end the supply of that agency worker to the hirer.”.