legislation.gov.uk provides all primary legislation from 1988- and "most pre-1988 primary legislation that is still in force." Most primary legislation is available in "revised" form, which includes amendments.* This free site includes all UK Statutory Instruments, Scottish Statutory Instruments and Northern Ireland Statutory Rules from 1987-. This site also includes the web page: legislation originating from the EU (= "EU legislation set out in Schedule 5 to the European Union (Withdrawal) Act 2018 (c. 16) along with Corrigenda (Correction slips for EU Legislation) and EU Directives published before 11:00 p.m. on 31 December 2020"). Additional information about the scope of available material appears in the FAQs.
The search feature allows researchers to retrieve statutes and statutory instruments by title, by year of enactment, by number and by type of legislation.
*More detail from legislation.gov.uk page Understanding Legislation: "In some cases we only have the original published (as enacted) version and no revised version. This occurs if the legislation was wholly repealed before 1991 and therefore was not included in the revised data set when it was extracted from Statutes in Force. In other cases we may only have a revised version if the original (as enacted) version is not available in a web-publishable format."
Westlaw provides UK statutes and statutory instruments currently in force.
Westlaw: United Kingdom Legislation: Statutes (scope: statutes currently in effect in UK, "[c]overage begins with 1267")
After retrieving a statute, be aware that link: Analysis yields commencement/status information and amendments, as well as (often) citing cases and (often) cites to journal articles/books.
Westlaw: United Kingdom Legislation: Statutory Instruments (scope: Statutory Instruments currently in effect in UK, 1948-)
Westlaw also provides United Kingdom Legislation: Retained EU Legislation
Westlaw also provides selected historic UK statutes and historic UK statutory instruments [from 1992-] in Westlaw: United Kingdom Legislation: Historic The specific databases are:
https://lawschool.westlaw.com > click link at top of screen: Westlaw, TWEN, Practical Law... > in pull-down menu, select: Westlaw UK Edge (which directs researchers to: Westlaw Edge UK). See this helpful tool: Westlaw UK User Guide: About Legislation Content. This guide notes:
Westlaw UK contains legislation dating back to 1267 including:
all UK Public and General Acts which were still in force in 1991, and all published subsequently
all Public and General Acts of the Scottish Parliament (ASPS)
all Local Acts published since 1991
all Church of England Measures published since 1991
all Welsh Assembly Measures from 2008-2011
all Welsh Acts from 2012
all Northern Ireland legislation from 1991
selected earlier UK Public and General Acts including all since 1949 published as originally enacted
Westlaw Edge UK home screen includes tab: Legislation:
Primary and Secondary Legislation (including: Brexit: Retained EU Legislation)
Westlaw Edge UK home screen also includes box: Browse by Topic. These topic pages guide researchers to many types of pertinent legal sources: latest developments, legislation, policy/guidance, available books, available journals, and Practical Law UK practice notes, trackers, toolkits, checklists and standard documents/clauses.
Lexis+ provides collections: UK Parliament Acts + UK Parliament SIs under category: All United Kingdom Statutes and Legislation. (Provider: Lexis+ UK)
Includes UK Parliament Acts. Scope: full, amended text of all public general Acts currently in force - public general Acts that are no longer in force are not available in full text.
Also includes multiple files of Statutory Instruments (SIs), grouped as follows: UK Parliament SIs 1786-1949, 1950-1979, 1980-1989, 1990-1999, 2000-2009 & 2010-Present.
BLS patrons: Feel free to contact email@example.com for help in finding historic statutes in their original form. Depending on a statute's date, we might be able to find it in a historic statutory collection contained in a subscription HeinOnline database, such as: The Statutes of the Realm vols. 1-11 (scope: 1235-1713) or Selden Society Publications and the History of Early English Law > tab: Revised Reports, Statutes and Cases. A historic document also might be available in the free Avalon Project provided by Yale Law School's Lillian Goldman Law Library.