diff --git a/cache/locallib.php b/cache/locallib.php
index 5b2d8aea2cf..fc927e0d39f 100644
--- a/cache/locallib.php
+++ b/cache/locallib.php
@@ -784,8 +784,16 @@ abstract class cache_administration_helper extends cache_helper {
 
         $locks = self::get_possible_locks_for_stores($plugindir, $plugin);
 
-        $url = new moodle_url('/cache/admin.php', array('action' => 'editstore'));
-        return new $class($url, array('plugin' => $plugin, 'store' => $store, 'locks' => $locks));
+        $url = new moodle_url('/cache/admin.php', array('action' => 'editstore', 'plugin' => $plugin, 'store' => $store));
+        $editform = new $class($url, array('plugin' => $plugin, 'store' => $store, 'locks' => $locks));
+        // See if the cachestore is going to want to load data for the form.
+        // If it has a customised add instance form then it is going to want to.
+        $storeclass = 'cachestore_'.$plugin;
+        $storedata = $stores[$store];
+        if (array_key_exists('configuration', $storedata) && method_exists($storeclass, 'config_set_edit_form_data')) {
+            $storeclass::config_set_edit_form_data($editform, $storedata['configuration']);
+        }
+        return $editform;
     }
 
     /**
diff --git a/cache/stores/file/lib.php b/cache/stores/file/lib.php
index 3e985122420..3ef346976d6 100644
--- a/cache/stores/file/lib.php
+++ b/cache/stores/file/lib.php
@@ -542,6 +542,26 @@ class cachestore_file implements cache_store, cache_is_key_aware {
         return $config;
     }
 
+    /**
+     * Allows the cache store to set its data against the edit form before it is shown to the user.
+     *
+     * @param moodleform $editform
+     * @param array $config
+     */
+    public static function config_set_edit_form_data(moodleform $editform, array $config) {
+        $data = array();
+        if (!empty($config['path'])) {
+            $data['path'] = $config['path'];
+        }
+        if (!empty($config['autocreate'])) {
+            $data['autocreate'] = $config['autocreate'];
+        }
+        if (!empty($config['prescan'])) {
+            $data['prescan'] = $config['prescan'];
+        }
+        $editform->set_data($data);
+    }
+
     /**
      * Checks to make sure that the path for the file cache exists.
      *
diff --git a/cache/stores/memcache/lib.php b/cache/stores/memcache/lib.php
index 6d4c33f2b1d..d684403db33 100644
--- a/cache/stores/memcache/lib.php
+++ b/cache/stores/memcache/lib.php
@@ -325,6 +325,24 @@ class cachestore_memcache implements cache_store {
         );
     }
 
+    /**
+     * Allows the cache store to set its data against the edit form before it is shown to the user.
+     *
+     * @param moodleform $editform
+     * @param array $config
+     */
+    public static function config_set_edit_form_data(moodleform $editform, array $config) {
+        $data = array();
+        if (!empty($config['servers'])) {
+            $servers = array();
+            foreach ($config['servers'] as $server) {
+                $servers[] = join(":", $server);
+            }
+            $data['servers'] = join("\n", $servers);
+        }
+        $editform->set_data($data);
+    }
+
     /**
      * Returns true if the user can add an instance of the store plugin.
      *
diff --git a/cache/stores/memcached/lib.php b/cache/stores/memcached/lib.php
index af74c41807d..ed079b1767e 100644
--- a/cache/stores/memcached/lib.php
+++ b/cache/stores/memcached/lib.php
@@ -393,6 +393,39 @@ class cachestore_memcached implements cache_store {
         );
     }
 
+    /**
+     * Allows the cache store to set its data against the edit form before it is shown to the user.
+     *
+     * @param moodleform $editform
+     * @param array $config
+     */
+    public static function config_set_edit_form_data(moodleform $editform, array $config) {
+        $data = array();
+        if (!empty($config['servers'])) {
+            $servers = array();
+            foreach ($config['servers'] as $server) {
+                $servers[] = join(":", $server);
+            }
+            $data['servers'] = join("\n", $servers);
+        }
+        if (!empty($config['compression'])) {
+            $data['compression'] = 1;
+        }
+        if (!empty($config['serialiser'])) {
+            $data['serialiser'] = $config['serialiser'];
+        }
+        if (!empty($config['prefix'])) {
+            $data['prefix'] = $config['prefix'];
+        }
+        if (!empty($config['hash'])) {
+            $data['hash'] = $config['hash'];
+        }
+        if (!empty($config['bufferwrites'])) {
+            $data['bufferwrites'] = 1;
+        }
+        $editform->set_data($data);
+    }
+
     /**
      * Returns true if the user can add an instance of the store plugin.
      *
diff --git a/cache/stores/mongodb/lib.php b/cache/stores/mongodb/lib.php
index 4ffc205ae96..c37e91da3fb 100644
--- a/cache/stores/mongodb/lib.php
+++ b/cache/stores/mongodb/lib.php
@@ -424,6 +424,41 @@ class cachestore_mongodb implements cache_store {
         return $return;
     }
 
+    /**
+     * Allows the cache store to set its data against the edit form before it is shown to the user.
+     *
+     * @param moodleform $editform
+     * @param array $config
+     */
+    public static function config_set_edit_form_data(moodleform $editform, array $config) {
+        $data = array();
+        if (!empty($config['server'])) {
+            $data['server'] = $config['server'];
+        }
+        if (!empty($config['database'])) {
+            $data['database'] = $config['database'];
+        }
+        if (!empty($config['extendedmode'])) {
+            $data['extendedmode'] = 1;
+        }
+        if (!empty($config['username'])) {
+            $data['username'] = $config['username'];
+        }
+        if (!empty($config['password'])) {
+            $data['password'] = $config['password'];
+        }
+        if (!empty($config['replicaset'])) {
+            $data['replicaset'] = $config['replicaset'];
+        }
+        if (!empty($config['usesafe'])) {
+            $data['usesafe'] = 1;
+            if ($data['usesafe'] !== true) {
+                $data['usesafevalue'] = (int)$data['usesafe'];
+            }
+        }
+        $editform->set_data($data);
+    }
+
     /**
      * Performs any necessary clean up when the store instance is being deleted.
      */