(1)An error in the completion of a document to which this section applies does not make the document invalid unless the error materially affects the effect of the document.
(2)This section applies to—
(a)a notice under section 14(3), 16(3)(c), 22(1) or 61(1),
(b)the document by which a referral is made to a rent officer under section 24(1),
(c)the document by which an application is made to a rent officer under section 42(1), and
(d)a notice to leave (as defined by section 62(1)).