diff --git a/charting/trust.xsl b/charting/trust.xsl
index baf2fb6f..d94b52bf 100644
--- a/charting/trust.xsl
+++ b/charting/trust.xsl
@@ -14,6 +14,7 @@
 	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 	xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
 	xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
+	xmlns:mdrpi="urn:oasis:names:tc:SAML:metadata:rpi"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	exclude-result-prefixes="md">
 	
@@ -21,7 +22,8 @@
 	<xsl:output method="text"/>
 	
 	<xsl:template match="md:EntitiesDescriptor">
-		<xsl:variable name="entities" select="//md:EntityDescriptor"/>
+		<xsl:variable name="entities" select="//md:EntityDescriptor
+			[descendant::mdrpi:RegistrationInfo/@registrationAuthority='http://ukfederation.org.uk']"/>
 		<xsl:value-of select="count($entities)"/>
 		<xsl:text> </xsl:text>
 		<xsl:variable name="idps" select="$entities[md:IDPSSODescriptor]"/>