Defined term

“the relevant day”

Defined in 82 Acts, 116 statutory instruments and 2 EU-derived instruments.

  1. Agricultural Tenancies Act 1995 Act
  2. Agriculture Act 2020 Act
  3. The Armed Forces and Reserve Forces (Compensation Scheme) Order 2011 SI
  4. The Armed Forces Pension Regulations 2014 SI 2 definitions
  5. The Armed Forces (Service Complaints) Regulations 2015 SI 2 definitions
  6. Automated Vehicles Act 2024 Act
  7. British Nationality Act 1981 Act
  8. Building Act 1984 Act 2 definitions
  9. The Building (Higher-Risk Buildings Procedures) (England) Regulations 2023 SI
  10. The Building (Registered Building Control Approvers etc.) (England) Regulations 2024 SI
  11. The Building Regulations 2010 SI
  12. The Building Safety (Registration of Higher-Risk Buildings and Review of Decisions) (England) Regulations 2023 SI
  13. Building Societies Act 1986 Act
  14. Capital Allowances Act 2001 Act 4 definitions
  15. Cardiff Bay Barrage Act 1993 Act
  16. The Charities Act 2006 (Commencement No.7, Transitional and Transitory Provisions and Savings) Order 2010 SI
  17. The Childcare (Exemptions from Registration) Order 2008 SI
  18. Childcare Payments Act 2014 Act
  19. The Childcare Payments Act 2014 (Commencement No. 3 and Transitional Provisions) Regulations 2017 SI
  20. The Childcare Payments (Eligibility) Regulations 2015 SI 2 definitions
  21. The Childcare Payments Regulations 2015 SI
  22. Civil Aviation Act 2012 Act
  23. The Client Money Protection Schemes for Property Agents (Requirement to Belong to a Scheme etc.) Regulations 2019 SI
  24. The Combined Authorities (Mayoral Elections) Order 2017 SI 2 definitions
  25. Commission Delegated Regulation (EU) 2019/33 of 17 October 2018 supplementing Regulation (EU) No 1308/2013 of the European Parliament and of the Council as regards applications for protection of designations of origin, geographical indications and traditional terms in the wine sector, the objection procedure, restrictions of use, amendments to product specifications, cancellation of protection, and labelling and presentation EU regulation
  26. Companies Act 2006 Act
  27. The Companies (Authorised Minimum) Regulations 2008 SI 3 definitions
  28. The Companies (Authorised Minimum) Regulations 2009 SI 3 definitions
  29. The Companies Authorised to Register, Unregistered Companies and Overseas Companies (Application of Company Law) Regulations 2025 SI
  30. The Competition Act 1998 (Motor Vehicle Agreements Block Exemption) (No. 2) Order 2023 SI 2 definitions
  31. The Competition Act 1998 (Research and Development Agreements Block Exemption) Order 2022 SI
  32. The Competition Act 1998 (Specialisation Agreements Block Exemption) Order 2022 SI
  33. The Competition Act 1998 (Technology Transfer Agreements Block Exemption) Order 2026 SI 2 definitions
  34. The Competition Act 1998 (Vertical Agreements Block Exemption) Order 2022 SI
  35. The Consumer Protection from Unfair Trading Regulations 2008 SI 2 definitions
  36. The Contracts for Difference (Electricity Supplier Obligations) Regulations 2014 SI
  37. Control of Pollution Act 1974 Act
  38. Coroners and Justice Act 2009 Act
  39. Corporation Tax Act 2009 Act
  40. Corporation Tax Act 2010 Act 23 definitions
  41. The Council Tax (Administration and Enforcement) Regulations 1992 SI 2 definitions
  42. The Council Tax (Alteration of Lists and Appeals) Regulations 1993 SI
  43. The Criminal Justice Act 2003 (Suitability for Fixed Term Recall) Order 2025 SI
  44. Crossrail Act 2008 Act
  45. The Customs (Tariff Quotas) (EU Exit) Regulations 2020 SI
  46. Data Protection Act 2018 Act
  47. Deregulation Act 2015 Act
  48. Digital Markets, Competition and Consumers Act 2024 Act 2 definitions
  49. The Early Years Foundation Stage (Exemptions from Learning and Development Requirements) Regulations 2008 SI
  50. The East Northamptonshire Resource Management Facility Order 2023 SI
  51. The Economic Crime (Anti-Money Laundering) Levy Regulations 2022 SI
  52. Education and Inspections Act 2006 Act
  53. Education and Skills Act 2008 Act
  54. The Education (Educational Provision for Improving Behaviour) Regulations 2010 SI
  55. The Education (Postgraduate Doctoral Degree Loans and the Education (Student Loans) (Repayment) (Amendment) (No. 2) etc.) Regulations 2018 SI
  56. The Education (Postgraduate Master's Degree Loans) Regulations 2016 SI
  57. The Education (Provision of Full-Time Education for Excluded Pupils) (England) Regulations 2007 SI 2 definitions
  58. The EEA Passport Rights (Amendment, etc., and Transitional Provisions) (EU Exit) Regulations 2018 SI 2 definitions
  59. The Electrical Safety Standards in the Private Rented Sector and Social Rented Sector (England) Regulations 2020 SI
  60. The Employment and Support Allowance Regulations 2008 SI
  61. Employment Rights Act 2025 Act 3 definitions
  62. The Employment Rights Act 2025 (Commencement No. 1 and Transitional and Saving Provisions) Regulations 2026 SI
  63. English Devolution and Community Empowerment Act 2026 Act
  64. European Union (Future Relationship) Act 2020 Act 2 definitions
  65. The Exchange Gains and Losses (Bringing into Account Gains or Losses) Regulations 2002 SI
  66. The Excise Duties (Road Fuel Gas) (Reliefs) Regulations 2004 SI
  67. Extradition Act 2003 Act 2 definitions
  68. The Ferrybridge Multifuel 2 Power Station Order 2015 SI
  69. Finance Act 1986 Act 2 definitions
  70. Finance Act 1994 Act
  71. Finance Act 1998 Act
  72. Finance Act 2003 Act 2 definitions
  73. Finance Act 2004 Act 4 definitions
  74. Finance Act 2011 Act
  75. Finance Act 2013 Act 6 definitions
  76. Finance Act 2016 Act 2 definitions
  77. Finance Act 2017 Act
  78. Finance Act 2019 Act
  79. Finance Act 2020 Act 2 definitions
  80. Finance Act 2022 Act 2 definitions
  81. Finance (No. 2) Act 1997 Act
  82. Finance (No. 2) Act 2023 Act 3 definitions
  83. The Financial Markets and Insolvency Regulations 1996 SI
  84. Financial Services and Markets Act 2000 Act
  85. The Financial Services and Markets Act 2000 (Cryptoassets) Regulations 2026 SI 2 definitions
  86. The Financial Services and Markets Act 2000 (Treatment of Assets of Insurers on Winding Up) Regulations 2001 SI
  87. The Financial Services and Markets Act 2023 (Mutual Recognition Agreement) (Switzerland) Regulations 2025 SI 2 definitions
  88. The Firefighters’ Pension Scheme (England) Regulations 2014 SI
  89. The General Medical Council (Constitution) Order 2002 SI
  90. The General Optical Council (Therapeutics and Contact Lens Specialties) Rules Order of Council 2008 SI
  91. The Greater London Authority Elections Rules 2007 SI 6 definitions
  92. The Greenhouse Gas Emissions Trading Scheme Auctioning Regulations 2021 SI
  93. The Greenhouse Gas Emissions Trading Scheme Order 2020 SI
  94. The Hazards in Social Housing (Prescribed Requirements) (England) Regulations 2025 SI
  95. The Health and Care Act 2022 (Storage of Gametes and Embryos) (Transitional Provision) Regulations 2024 SI
  96. Housing and Planning Act 2016 Act
  97. Housing and Regeneration Act 2008 Act
  98. Human Fertilisation and Embryology Act 1990 Act
  99. The Income Tax (Digital Obligations) Regulations 2026 SI
  100. Income Tax (Earnings and Pensions) Act 2003 Act 8 definitions
  101. The Indirect Taxes (Disclosure of Avoidance Schemes) Regulations 2017 SI
  102. The Infrastructure Planning (Fees) Regulations 2010 SI 2 definitions
  103. Inheritance Tax Act 1984 Act
  104. Insolvency Act 1986 Act 3 definitions
  105. The International Tax Enforcement (Disclosable Arrangements) Regulations 2023 SI
  106. Judicial Pensions and Retirement Act 1993 Act 3 definitions
  107. The Judicial Pensions (Fee-Paid Judges) Regulations 2017 SI 4 definitions
  108. The Judicial Pensions Regulations 2015 SI 2 definitions
  109. Land Drainage Act 1991 Act
  110. The Large and Medium-sized Companies and Groups (Accounts and Reports) Regulations 2008 SI
  111. Legal Aid, Sentencing and Punishment of Offenders Act 2012 Act 2 definitions
  112. Legal Services Act 2007 Act
  113. Levelling-up and Regeneration Act 2023 Act
  114. The Limited Liability Partnerships (Application and Modification of Company Law) Regulations 2025 SI
  115. The Local Authorities (Contracting Out of BID Levy Billing, Collection and Enforcement Functions) Order 2005 SI
  116. The Local Authorities (Elected Mayors)(Elections, Terms of Office and Casual Vacancies)(England) Regulations 2012 SI
  117. The Local Authorities (Mayoral Elections) (England and Wales) Regulations 2007 SI 2 definitions
  118. Local Democracy, Economic Development and Construction Act 2009 Act 3 definitions
  119. Local Government Act 1972 Act 2 definitions
  120. Local Government Finance Act 1992 Act
  121. Local Government (Miscellaneous Provisions) Act 1976 Act 2 definitions
  122. The Merchant Shipping (Anti-Fouling Systems) Regulations 2024 SI
  123. The Mobile Homes (Requirement for Manager of Site to be Fit and Proper Person) (England) Regulations 2020 SI 2 definitions
  124. The National Assembly for Wales (Transfer of Property, Rights and Liabilities) Order 2007 SI
  125. The National Health Service (General Dental Services Contracts) Regulations 2005 SI
  126. The National Health Service (Integrated Care Boards: Description of NHS Primary Medical Services) Regulations 2022 SI
  127. The National Health Service Pension Scheme Regulations 2008 SI 4 definitions
  128. The National Health Service (Personal Dental Services Agreements) Regulations 2005 SI
  129. The National Health Service (Pharmaceutical and Local Pharmaceutical Services) Regulations 2013 SI
  130. The National Insurance Contributions (Application of Part 7 of the Finance Act 2004) Regulations 2012 SI
  131. National Security Act 2023 Act
  132. The Naval, Military and Air Forces Etc. (Disablement and Death) Service Pensions Order 2006 SI
  133. The Non-Domestic Rating (Alteration of Lists and Appeals) (England) Regulations 2005 SI
  134. The Non-Domestic Rating (Alteration of Lists and Appeals) Regulations 1993 SI
  135. The Non-Domestic Rating (Chargeable Amounts) (England) Regulations 2004 SI
  136. The Non-Domestic Rating (Chargeable Amounts) (England) Regulations 2009 SI
  137. The Non-Domestic Rating (Chargeable Amounts) (England) Regulations 2016 SI
  138. The Non-Domestic Rating (Chargeable Amounts) (England) Regulations 2022 SI
  139. The Non-Domestic Rating (Chargeable Amounts) (England) Regulations 2026 SI
  140. The Non-Domestic Rating (Collection and Enforcement) (Local Lists) Regulations 1989 SI 11 definitions
  141. The Nuclear Regulated Asset Base Model (Revenue Collection) Regulations 2023 SI 2 definitions
  142. The Occupational and Personal Pension Schemes (Automatic Enrolment) Regulations 2010 SI
  143. The Occupational Pension Schemes (Scheme Administration) Regulations 1996 SI 2 definitions
  144. The Offshore Combustion Installations (Prevention and Control of Pollution) Regulations 2001 SI
  145. Oil Taxation Act 1975 Act
  146. Online Safety Act 2023 Act 4 definitions
  147. The Passenger Name Record Data and Miscellaneous Amendments Regulations 2018 SI
  148. Patents Act 1977 Act
  149. Planning Act 2008 Act
  150. The Police and Crime Commissioner Elections Order 2012 SI
  151. Police and Criminal Evidence Act 1984 Act
  152. The Police Pensions Regulations 2015 SI 2 definitions
  153. Police Reform and Social Responsibility Act 2011 Act
  154. Political Parties, Elections and Referendums Act 2000 Act
  155. The Public Service (Civil Servants and Others) Pensions Regulations 2014 SI 2 definitions
  156. The Public Service Obligations in Transport Regulations 2023 SI
  157. The Qualifying Oil Fields Order 2012 SI
  158. The Recognised Auction Platforms Regulations 2011 SI
  159. Regulation (EU) 2016/1011 of the European Parliament and of the Council of 8 June 2016 on indices used as benchmarks in financial instruments and financial contracts or to measure the performance of investment funds and amending Directives 2008/48/EC and 2014/17/EU and Regulation (EU) No 596/2014 (Text with EEA relevance) EU regulation
  160. The Rehabilitation Courses (Relevant Drink Offences) Regulations 2012 SI
  161. The Renewables Obligation Order 2015 SI
  162. The Reporting on Payment Practices and Performance Regulations 2017 SI
  163. Representation of the People Act 1983 Act
  164. The Republic of Belarus (Sanctions) (EU Exit) Regulations 2019 SI 2 definitions
  165. The Russia (Sanctions) (EU Exit) Regulations 2019 SI 9 definitions
  166. The Sentencing Act 2026 (Commencement No. 1) Regulations 2026 SI
  167. The Sentencing Act 2026 (Commencement No. 6 and Revocation) Regulations 2026 SI
  168. Social Security Administration Act 1992 Act 4 definitions
  169. Social Security Administration (Northern Ireland) Act 1992 Act
  170. The Social Security and Child Support (Decisions and Appeals) Regulations 1999 SI
  171. The Social Security (Claims and Payments) Regulations 1987 SI 3 definitions
  172. Social Security Contributions and Benefits Act 1992 Act
  173. Social Security Contributions and Benefits (Northern Ireland) Act 1992 Act
  174. The Social Security (Crediting and Treatment of Contributions, and National Insurance Numbers) Regulations 2001 SI
  175. The Social Security (Incapacity Benefit) Regulations 1994 SI
  176. The Social Security (Lone Parents and Miscellaneous Amendments) Regulations 2008 SI 3 definitions
  177. The Social Security (Lone Parents and Miscellaneous Amendments) Regulations 2012 SI 2 definitions
  178. The Social Security (Maximum Additional Pension) Regulations 2010 SI
  179. Space Industry Act 2018 Act
  180. The Space Industry Act 2018 (Commencement No. 2, Transitional and Savings Provisions) Regulations 2021 SI
  181. Taxation (International and Other Provisions) Act 2010 Act 2 definitions
  182. Taxation of Chargeable Gains Act 1992 Act 3 definitions
  183. Taxes Management Act 1970 Act
  184. Terrorism Prevention and Investigation Measures Act 2011 Act
  185. Theft Act 1968 Act
  186. The Town and Country Planning (Entertainment Resort Complex, Bedford) Special Development (No. 2) Order 2025 SI
  187. The Town and Country Planning (General Permitted Development) (England) Order 2015 SI
  188. The Town and Country Planning (General Permitted Development) Order 1995 SI
  189. Trade Union and Labour Relations (Consolidation) Act 1992 Act
  190. Transport Act 2000 Act 3 definitions
  191. Tribunals, Courts and Enforcement Act 2007 Act
  192. The Turks and Caicos Islands Constitution (Amendment) Order 2024 SI
  193. United Kingdom Internal Market Act 2020 Act 2 definitions
  194. The Universal Credit, Personal Independence Payment, Jobseeker's Allowance and Employment and Support Allowance (Claims and Payments) Regulations 2013 SI 2 definitions
  195. Value Added Tax Act 1994 Act 2 definitions
  196. The Vehicle Drivers (Certificates of Professional Competence) Regulations 2007 SI 2 definitions
  197. The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 SI
  198. Water Industry Act 1991 Act 3 definitions
  199. Welfare Benefits Up-rating Act 2013 Act
  200. Welfare Reform and Work Act 2016 Act

Definitions are taken from the instruments as published on zoomLaw, for guidance only. Check the instrument itself for its scope and any amendments.