What it does
This instrument is a Rules of Court amendment titled the Supreme Court Amendment (Prerogative Writs) Rules 2011. Its operative mechanics are narrow and procedural. Section 1 gives the short title (Supreme Court Amendment (Prerogative Writs) Rules 2011). Section 2 fixes commencement: the Rules take effect on the day on which their making is notified in the Gazette. The instrument identifies the Supreme Court Rules 2000 as the Principal Rules (s 3), and then records, in a sequence of paragraphs labelled 4-28, that the amendments effected by each rule have been incorporated into the authorised version of the Supreme Court Rules 2000.
Concretely, the instrument does not set out the text of new or amended procedural provisions itself; instead it effects amendments to the Principal Rules and records that those amendments have been incorporated into the authorised consolidated version of the Supreme Court Rules 2000 (each of rules 4-28). The Gazette notification is recorded at the end of the instrument: Notified in the Gazette on 20 April 2011. The instrument also records administration responsibility (These Rules of Court are administered in the Department of Justice) and bears signatures of the Chief Justice, puisne judges and the Registrar, which indicates judicial sign-off of the Rules as executed (signatory block).
In short, the instrument (a) amends the Supreme Court Rules 2000 in relation to prerogative writs (as indicated by the title), (b) takes effect on Gazette notification (s 2; Gazette date recorded 20 April 2011), and (c) declares that the specific textual amendments have been incorporated into the authorised consolidated version of the Principal Rules (rules 4-28). The instrument itself does not reproduce the operative changes; it functions as the formal amendment instrument and notification that the consolidated authorised Rules have been updated.