The Bluebook Uniform System of Citation, 19th edition, offers explanation and examples in Table 2. Page 318 of the 19th edition contains information related to the United Kingdom.
Case law:
For cases before 1865:
Somerset v. Stewart, (1772) 98 Eng. Rep. 499 (K.B.).
For cases after 1865:
Derby v. Weldon, (1989) 3 All. E.R. 118.
For cases after 2001:
Use medium neutral citation. See Practice Direction (Neutral Citations), (2002) 1 W.L.R. 346 (Eng.).
Statute:
E.g., for statutes enacted after 1963 (prior to 1963 include the regnal year after the date):
Airport Authority Act, 1965, c. 16 (Eng.)
Statutory Instruments:
Patent Rules, 1958, S.I. 1958/73, art. 3, ¶3 (U.K.)
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