13(1)The relevant national authority may by regulations made by statutory instrument amend this Schedule—E+W
(a)to alter a reference to three months in this Schedule into—
(i)a reference to six months, or
(ii)a reference to any other specified period which is less than six months, or
(b)to alter a reference which has been altered by virtue of paragraph (a) or this paragraph (but not so as to result in the reference being to a specified period of more than six months).
(2)Sub-paragraph (1) applies to references in this Schedule whether or not they are contained in text which is to be treated as if inserted or substituted into another enactment.