1U.K.Where—
(a)a person who has entered on a period of whole-time service was last employed within the period of four weeks immediately preceding the beginning of that service in any undertaking, and
(b)any change (whether before or after the commencement of this Act) takes place in the person carrying on that undertaking or that undertaking becomes comprised in any other undertaking,
references in this Act to the former employer of that person shall be construed as references to the person for the time being carrying on that undertaking or that other undertaking, as the case may be.