diff --git a/mdx/uk/add_hide_element.xsl b/mdx/uk/add_hide_element.xsl
new file mode 100644
index 00000000..2b8010b6
--- /dev/null
+++ b/mdx/uk/add_hide_element.xsl
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+	add_hide_element.xsl
+
+	Adds the UK federation "Hide from WAYF" marker element to IdPs which are already
+	labelled as members of the REFEDS "Hide from Discovery" entity category.
+
+-->
+<xsl:stylesheet version="1.0"
+	xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
+	xmlns:mdattr="urn:oasis:names:tc:SAML:metadata:attribute"
+	xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
+	xmlns:wayf="http://sdss.ac.uk/2006/06/WAYF"
+	
+	xmlns="urn:oasis:names:tc:SAML:2.0:metadata"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+	exclude-result-prefixes="md">
+
+	<!--Force UTF-8 encoding for the output.-->
+	<xsl:output omit-xml-declaration="no" method="xml" encoding="UTF-8" indent="yes"/>
+
+	<xsl:template match="md:EntityDescriptor[md:IDPSSODescriptor]/md:Extensions
+		[mdattr:EntityAttributes/saml:Attribute
+			[@Name = 'http://macedir.org/entity-category']
+			[@NameFormat = 'urn:oasis:names:tc:SAML:2.0:attrname-format:uri']
+			[saml:AttributeValue[.='http://refeds.org/category/hide-from-discovery']]
+		]">
+		<xsl:copy>
+			<xsl:text>&#10;</xsl:text>
+			<xsl:text>        </xsl:text>
+			<xsl:element name="wayf:HideFromWAYF"/>
+			<xsl:apply-templates select="node()"/>
+		</xsl:copy>
+	</xsl:template>
+	
+	<!--By default, copy text blocks, comments and attributes unchanged.-->
+	<xsl:template match="text()|comment()|@*">
+		<xsl:copy/>
+	</xsl:template>
+	
+	<!--By default, copy all elements from the input to the output, along with their attributes and contents.-->
+	<xsl:template match="*">
+		<xsl:copy>
+			<xsl:apply-templates select="node()|@*"/>
+		</xsl:copy>
+	</xsl:template>
+	
+</xsl:stylesheet>
diff --git a/mdx/uk/generate.xml b/mdx/uk/generate.xml
index e4e7531e..06b09848 100644
--- a/mdx/uk/generate.xml
+++ b/mdx/uk/generate.xml
@@ -239,6 +239,18 @@
                 <ref bean="removeBlacklistedEntities"/>
                 <ref bean="standardImportActions"/>
                 
+                <!--
+                    Add UK federation HideFromWAYF element as an equivalent to membership in
+                    the REFEDS Hide from Discovery category.
+                -->
+                <bean p:id="uk_addHideFromWAYF" parent="XSLTransformationStage">
+                    <property name="XSLResource">
+                        <bean parent="ClassPathResource">
+                            <constructor-arg value="uk/add_hide_element.xsl"/>
+                        </bean>
+                    </property>                    
+                </bean>
+                
                 <!--
                     Silently remove entities which are marked as
                     having errors.