The appropriate national authority may by regulations make such provision as the authority considers appropriate—
for the general purposes, or any particular purpose, of this Chapter,
in consequence of any provision made by virtue of this Chapter or for giving full effect to it.
Such regulations may, in particular, provide for—
the form and content of sustainability certificates and interim certificates,
the form and content of written statements of the kind mentioned in section 279(1)(b),
ways in which sustainability standards may be met,
the issue of guidance for the purposes of this Chapter,
the relationship between any provision made by virtue of this Chapter and any provision ... in relation to energy performance certificates.
Regulations made by virtue of subsection (2)(a) or (b) may, in particular, provide for the form or content of the documents concerned to be such as may be approved by the appropriate national authority.
In subsection (2)(e) "energy performance certificate" has the same meaning as in the Energy Performance of Buildings (Certificates and Inspections) (England and Wales) Regulations 2007 (S.I. 2007/991) (see regulation 2(1)) or any corresponding subsequent regulations.