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  "id": "uksi/1984/579",
  "title": "The M4 London—South Wales Motorway (Heathrow Spur to M25 Interchange) Scheme 1984",
  "short_title": "M4 London—South Wales Motorway (Heathrow Spur to M25 Interchange) 1984",
  "long_title": null,
  "citation": "S.I. 1984/579",
  "type": "uksi",
  "year": "1984",
  "number": "579",
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  "date": "1984-04-18",
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    "source_url": "https://www.legislation.gov.uk/uksi/1984/579",
    "retrieved_at": "2026-10-29T17:41:56.464921+00:00"
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  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}