diff --git a/iris_grib/_load_convert.py b/iris_grib/_load_convert.py
index 8f72b37a..f27c551d 100644
--- a/iris_grib/_load_convert.py
+++ b/iris_grib/_load_convert.py
@@ -2515,7 +2515,7 @@ def data_representation_section(section):
     template = section['dataRepresentationTemplateNumber']
 
     # Supported templates for both grid point and spectral data:
-    grid_point_templates = (0, 1, 2, 3, 4, 40, 41, 61)
+    grid_point_templates = (0, 1, 2, 3, 4, 40, 41, 42, 61)
     spectral_templates = (50, 51)
     supported_templates = grid_point_templates + spectral_templates
 
diff --git a/iris_grib/tests/unit/load_convert/test_data_representation_section.py b/iris_grib/tests/unit/load_convert/test_data_representation_section.py
new file mode 100644
index 00000000..e4992ed5
--- /dev/null
+++ b/iris_grib/tests/unit/load_convert/test_data_representation_section.py
@@ -0,0 +1,38 @@
+# Copyright iris-grib contributors
+#
+# This file is part of iris-grib and is released under the LGPL license.
+# See COPYING and COPYING.LESSER in the root of the repository for full
+# licensing details.
+"""
+Test function :func:`iris_grib._load_convert.data_representation_section.`
+
+"""
+
+# import iris_grib.tests first so that some things can be initialised
+# before importing anything else.
+import iris_grib.tests as tests
+
+from iris.exceptions import TranslationError
+
+from iris_grib._load_convert import data_representation_section
+from iris_grib.tests.unit import _make_test_message
+
+
+class Test(tests.IrisGribTest):
+    def test_supported_templates(self):
+        template_nums = [0, 1, 2, 3, 4, 40, 41, 42, 50, 51, 61]
+        for template_num in template_nums:
+            message = _make_test_message(
+                {5: {'dataRepresentationTemplateNumber': template_num}})
+            data_representation_section(message.sections[5])
+
+    def test_unsupported_template(self):
+        message = _make_test_message(
+            {5: {'dataRepresentationTemplateNumber': 5}})
+        err_msg = r'Template \[5\] is not supported'
+        with self.assertRaisesRegex(TranslationError, err_msg):
+            data_representation_section(message.sections[5])
+
+
+if __name__ == '__main__':
+    tests.main()