diff --git a/mdx/uk/README.md b/mdx/uk/README.md
index 869e64c8..8e7a63a1 100644
--- a/mdx/uk/README.md
+++ b/mdx/uk/README.md
@@ -81,7 +81,6 @@ Status (2017-12-05):
 
 ### Fallback Aggregate vs. Production Aggregate
 
-Status (2020-07-01):
+Status (2020-09-01):
 
-* The `back` aggregate does not currently include the `cacheDuration` attribute
-  which is present with a value of six hours in all others.
+* These aggregates are currently identical.
diff --git a/mdx/uk/generate.xml b/mdx/uk/generate.xml
index 2c27e2f8..aefec69e 100644
--- a/mdx/uk/generate.xml
+++ b/mdx/uk/generate.xml
@@ -576,6 +576,8 @@
                 <ref bean="errorTerminatingFilter"/>
 
                 <ref bean="assembleAggregate"/>
+                <bean parent="mda.SetCacheDurationStage"
+                    p:cacheDuration="${cacheDuration.aggregate.duration}"/>
                 <ref bean="stripEmptyExtensions"/>
                 <ref bean="uk_finaliseFallback"/>
                 <ref bean="uk_normaliseFallback"/>