diff --git a/.cirrus.yml b/.cirrus.yml
index 839ef7fc77..3a3989e46c 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -26,7 +26,7 @@ env:
   # Maximum cache period (in weeks) before forcing a new cache upload.
   CACHE_PERIOD: "2"
   # Increment the build number to force new cartopy cache upload.
-  CARTOPY_CACHE_BUILD: "0"
+  CARTOPY_CACHE_BUILD: "3"
   # Increment the build number to force new conda cache upload.
   CONDA_CACHE_BUILD: "0"
   # Increment the build number to force new nox cache upload.
@@ -72,6 +72,14 @@ linux_task_template: &LINUX_TASK_TEMPLATE
     fingerprint_script:
       - echo "${CIRRUS_OS}"
       - echo "$(date +%Y).$(expr $(date +%U) / ${CACHE_PERIOD}):${CARTOPY_CACHE_BUILD}"
+    populate_script:
+      - conda create --quiet --name cartopy-cache cartopy
+      - source ${HOME}/miniconda/etc/profile.d/conda.sh >/dev/null 2>&1
+      - conda activate cartopy-cache >/dev/null 2>&1
+      - cd $(mktemp -d)
+      - wget --quiet https://raw.githubusercontent.com/SciTools/cartopy/master/tools/cartopy_feature_download.py
+      - python cartopy_feature_download.py physical --output ${HOME}/.local/share/cartopy --no-warn
+      - conda deactivate >/dev/null 2>&1
   nox_cache:
     folder: ${CIRRUS_WORKING_DIR}/.nox
     reupload_on_changes: true
diff --git a/docs/src/common_links.inc b/docs/src/common_links.inc
index d59f98de47..e22b37c87e 100644
--- a/docs/src/common_links.inc
+++ b/docs/src/common_links.inc
@@ -2,6 +2,7 @@
     Common resources in alphabetical order:
 
 .. _black: https://black.readthedocs.io/en/stable/
+.. _cartopy: https://github.com/SciTools/cartopy
 .. _.cirrus.yml: https://github.com/SciTools/iris/blob/main/.cirrus.yml
 .. _flake8: https://flake8.pycqa.org/en/stable/
 .. _.flake8.yml: https://github.com/SciTools/iris/blob/main/.flake8
diff --git a/docs/src/whatsnew/1.3.rst b/docs/src/whatsnew/1.3.rst
index beaa594ab5..1895711379 100644
--- a/docs/src/whatsnew/1.3.rst
+++ b/docs/src/whatsnew/1.3.rst
@@ -34,8 +34,8 @@ Loading ABF/ABL Files
 ---------------------
 
 Support for the ABF and ABL file formats (as
-`defined <http://cliveg.bu.edu/modismisr/lai3g-fpar3g.html>`_ by the
-climate and vegetation research group of Boston University), is
+`defined <https://nasanex.s3.amazonaws.com/AVHRR/GIMMS/LAI3G/00README_V01.pdf>`_
+by the climate and vegetation research group of Boston University), is
 currently provided under the "experimental" system. As such, ABF/ABL
 file detection is not automatically enabled.
 
diff --git a/lib/iris/fileformats/abf.py b/lib/iris/fileformats/abf.py
index c031bfb415..678d9b04cf 100644
--- a/lib/iris/fileformats/abf.py
+++ b/lib/iris/fileformats/abf.py
@@ -10,7 +10,7 @@
 Including this module adds ABF and ABL loading to the session's capabilities.
 
 The documentation for this file format can be found
-`here <http://cliveg.bu.edu/modismisr/lai3g-fpar3g.html>`_.
+`here <https://nasanex.s3.amazonaws.com/AVHRR/GIMMS/LAI3G/00README_V01.pdf>`_.
 
 """
 
diff --git a/lib/iris/fileformats/netcdf.py b/lib/iris/fileformats/netcdf.py
index 60da5c5e97..9dd8848f7f 100644
--- a/lib/iris/fileformats/netcdf.py
+++ b/lib/iris/fileformats/netcdf.py
@@ -6,7 +6,7 @@
 """
 Module to support the loading of a NetCDF file into an Iris cube.
 
-See also: `netCDF4 python <http://code.google.com/p/netcdf4-python/>`_.
+See also: `netCDF4 python <https://github.com/Unidata/netcdf4-python>`_
 
 Also refer to document 'NetCDF Climate and Forecast (CF) Metadata Conventions'.