(1) An employee shall not be entitled to redundancy payment by reason of having been laid off or kept on short-time unless -

(a) he has been laid off or kept on short-time for four or more consecutive weeks or, within a period of thirteen weeks, for a series of six or more weeks of which not more than three were consecutive, and

(b) after the expiry of the relevant period of lay-off or short-time mentioned in paragraph (a) and not later than four weeks after the cessation of the lay-off or short-time, he gives to his employer notice (in this Part referred to as a notice of intention to claim) in writing of his intention to claim redundancy payment in respect of lay-off or short-time.