Unmeasured working time
4. Regulation 20 of the 1998 Regulations shall be re-numbered as paragraph (1) of that regulation, and after that provision the following paragraph shall be inserted—
“(2) Where part of the working time of a worker is measured or predetermined or cannot be determined by the worker himself but the specific characteristics of the activity are such that, without being required to do so by the employer, the worker may also do work the duration of which is not measured or predetermined or can be determined by the worker himself, regulations 4(1) and (2) and 6(1), (2) and (7) shall apply only to so much of his work as is measured or predetermined or cannot be determined by the worker himself.”