diff --git a/docs/guidance/implementation.md b/docs/guidance/implementation.md
index 4b2b5f0d..23c62c11 100644
--- a/docs/guidance/implementation.md
+++ b/docs/guidance/implementation.md
@@ -10,7 +10,7 @@ In this guidance we discuss options for the collection of data, the flow of data
 
 ![Standalone infrastructure transparency portal](../_static/images/implementation_scenario_1.png)
 
-In this model, procuring entities enter project and contract level data directly into an infrastructure transparency portal. The portal publishes project data and summary contracting process data in OC4IDS format. CoST Honduras uses this model in [SISOCS](https://sisocs.org/), as does CoST West Lombok in [INTRAS](http://intras.fllajlombokbaratkab.or.id/).
+In this model, procuring entities enter project and contract level data directly into an infrastructure transparency portal. The portal publishes project data and summary contracting process data in OC4IDS format. CoST Honduras uses this model in [SISOCS](https://sisocs.org/), as does CoST West Lombok in [INTRAS](https://intras.fllajlombokbaratkab.or.id/).
 
 The main benefit of this approach is that it is relatively simple because it does not involve integrating data from different systems. The downside of this approach is that it can increase the data entry burden on procuring entities who might also need to enter contracting process data into a separate procurement system.
 
diff --git a/docs/guidance/using.md b/docs/guidance/using.md
index b982d5eb..b3522c29 100644
--- a/docs/guidance/using.md
+++ b/docs/guidance/using.md
@@ -57,7 +57,7 @@ This might be possible by downloading and filtering spreadsheets of the data, or
 ````{admonition} Worked example
 :class: Tip
 
-Using the UK Contracts Finder dataset in OCDS format, and [OCDS Kingfisher](https://github.com/open-contracting/kingfisher/), we can use the following query to fetch contracting processes classified under the ['Architectural, construction, engineering and inspection services'](http://cpv.data.ac.uk/code-71000000.html) hierarchy of the EU Common Procurement Vocabulary.
+Using the UK Contracts Finder dataset in OCDS format, and [OCDS Kingfisher](https://github.com/open-contracting/kingfisher/), we can use the following query to fetch contracting processes classified under the ['Architectural, construction, engineering and inspection services'](https://web-archive.southampton.ac.uk/cpv.data.ac.uk/code-71000000.html) hierarchy of the EU Common Procurement Vocabulary.
 
 ```sql
 -- The following query runs against a filtered set of data in Kingfisher.
diff --git a/docs/locale/es/LC_MESSAGES/guidance/using.po b/docs/locale/es/LC_MESSAGES/guidance/using.po
index ac8b07ee..54a31060 100644
--- a/docs/locale/es/LC_MESSAGES/guidance/using.po
+++ b/docs/locale/es/LC_MESSAGES/guidance/using.po
@@ -223,14 +223,14 @@ msgid ""
 "Kingfisher](https://github.com/open-contracting/kingfisher/), we can use the"
 " following query to fetch contracting processes classified under the "
 "['Architectural, construction, engineering and inspection "
-"services'](http://cpv.data.ac.uk/code-71000000.html) hierarchy of the EU "
+"services'](https://web-archive.southampton.ac.uk/cpv.data.ac.uk/code-71000000.html) hierarchy of the EU "
 "Common Procurement Vocabulary."
 msgstr ""
 "Usando el conjunto de datos en formato OCDS de UK Contracts Finder y [OCDS "
 "Kingfisher](https://github.com/open-contracting/kingfisher/), podemos usar "
 "la siguiente consulta para obtener procesos de contratación clasificados "
 "bajo la jerarquía ['Servicios de arquitectura, construcción, ingeniería e "
-"inspección'](http://cpv.data.ac.uk/code-71000000.html) del Vocabulario Común"
+"inspección'](https://web-archive.southampton.ac.uk/cpv.data.ac.uk/code-71000000.html) del Vocabulario Común"
 " de Adquisiciones de la UE (CPV, por sus siglas en inglés)."
 
 #: ../../docs/guidance/using.md:29