xmlns:atom="http://www.w3.org/2005/Atom"
21. The register must be kept from—
(a)1 September 2007 in respect of persons who begin work at the institution on or after 1s September 2007; and
(b)1 September 2008 in respect of persons who are in post on 1 September 2008 and who began work at the institution before 1 September 2007.