Where the application of any provision of these Regulations is excluded by regulation 21 or 22, or is modified or excluded by means of a collective agreement or a workforce agreement under regulation 23(a), and a worker is accordingly required by his employer to work during a period which would otherwise be a rest period or rest break—
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(a)ÌýÌýÌýÌý his employer shall wherever possible allow him to take an equivalent period of compensatory rest, and
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(b)