Section 21(4)
Where a subscriber who has caused a number allocated to a line of his to be listed in the register kept under regulation 26 has notified a caller that he does not, for the time being, object to such calls being made on that line by that caller, such calls may be made by that caller on that line, notwithstanding that the number allocated to that line is listed in the said register.
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Source: legislation.gov.uk · retrieved 2026-09-04