diff --git a/bin/csv-import.php b/bin/csv-import.php
index 16cbe6a..b801b75 100644
--- a/bin/csv-import.php
+++ b/bin/csv-import.php
@@ -49,6 +49,10 @@
     cli_write('.');
 });
 
+
+cli_writeln("\nWarnings:");
+print_r(OuUser::getWarnings());
+
 cli_writeln("\nUsers inserted:  $count");
 
 
diff --git a/db/User.php b/db/User.php
index 674ac2d..44bab73 100644
--- a/db/User.php
+++ b/db/User.php
@@ -27,7 +27,7 @@ class User
     const CSV_TEAM = 4;
 
     const PREFIX = 'ouop_';
-    const UNDEF_INSTRUMENT = 'kd';
+    const UNDEF_INSTRUMENT = 'tpt';  //'kd';
     const INSTRUMENT_REGEX = '@^(kd|tpt)@';
 
     const OUCU_REGEX = '@^[a-z]{2,4}\d{1,7}$@';
@@ -35,6 +35,8 @@ class User
     const USERNAME_REGEX = '@^httpopenidopenacukoucu(?P<oucu>\w+)$@';
     const USERNAME_REPLACE = '@^(httpopenidopenacukoucu)?@';
 
+    protected static $warnings = [];
+
     /** Get plugin DB record for given username.
      * @return object
      */
@@ -103,9 +105,9 @@ public static function insertFromCsv($filename = '../example.csv', $ignore_headi
             }
 
             $user_record = (object) [
-                'oucu' => self::validateOucu($row[ self::CSV_OUCU ]),  # 0,
+                'oucu' => self::validateOucu($row[ self::CSV_OUCU ], $count),  # 0,
                 'course_presentation' => $row[ self::CSV_OUCU + 1 ], # 1,
-                'teslainstrument' => self::validateInstrument(self::row($row, self::CSV_OUCU + 2)),
+                'teslainstrument' => self::validateInstrument(self::row($row, self::CSV_OUCU + 2), $count, $row[ self::CSV_OUCU ]),
                 'notes'     => self::row($row, self::CSV_OUCU + 3),  # 3,
                 'is_team'   => self::row($row, self::CSV_TEAM),      # 4,
                 'firstname' => self::row($row, self::CSV_TEAM + 1),  # 5,
@@ -125,18 +127,20 @@ public static function insertFromCsv($filename = '../example.csv', $ignore_headi
         return $count;
     }
 
-    protected static function validateOucu($oucu)
+    protected static function validateOucu($oucu, $row)
     {
         if (!preg_match(self::OUCU_REGEX, $oucu)) {
-            throw new Exception('Unexpected OUCU format: ' . $oucu);
+            self::$warnings[] = [ 'row' => $row, 'msg' => 'Unexpected OUCU', 'oucu' => $oucu ];
+            echo 'W';
+            //throw new Exception('Unexpected OUCU format: ' . $oucu);
         }
         return $oucu;
     }
 
-    protected static function validateInstrument($instrument)
+    protected static function validateInstrument($instrument, $row, $ref)
     {
         if (!preg_match(self::INSTRUMENT_REGEX, $instrument)) {
-            throw new Exception('Unexpected TeSLA instrument code: '. $instrument);
+            throw new Exception(sprintf('Unexpected TeSLA instrument code, %d, %s: "%s"', $row, $ref, $instrument));
         }
         return $instrument;
     }
@@ -236,6 +240,11 @@ public static function getRoles()
         return (object) [ 'is_admin' => is_siteadmin(), 'roles' => $roles, 'is_loggedin' => isloggedin() ];
     }
 
+    public static function getWarnings()
+    {
+        return self::$warnings;
+    }
+
     // ====================================================================
 
     /** Get URL relating to the TeSLA instrument assigned to the user (in the DB) [ MOVE ] ?
diff --git a/index.php b/index.php
index bf44135..61fd178 100644
--- a/index.php
+++ b/index.php
@@ -18,7 +18,8 @@
 class Ou_Open_Id_Form {
 
     const ACTION = '/login/index.php';
-    const OUCU_REGEX  = '[a-z]{2,4}\d{1,7}';
+    const OUCU_REGEX  = '[a-z]{1,6}\d{1,7}';  // Was: '[a-z]{2,4}\d{1,7}'.
+    const OUCU_MIN    = 2;  // Was: 3.
     const OPEN_ID_URL = 'http://openid.open.ac.uk/oucu/';
     const JQUERY_URL  = 'https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js';
 
@@ -59,7 +60,7 @@ public static function printOucu() {
               ?>
               <input
                 id="oucu" value="<?php Ou_Open_Id_Form::printOucu() ?>"
-                required="required" aria-required="true" pattern="[a-z]{2,4}\d{1,7}" minlength="3" maxlength="9"
+                required="required" aria-required="true" pattern="<?php echo Ou_Open_Id_Form::OUCU_REGEX ?>" minlength="2" maxlength="9"
                 title="<?php print_string( 'login_field_help', OUOP_STRING ) ?>" /></label>
 
               <input type="hidden" id="openid_base_url" value="<?php echo Ou_Open_Id_Form::OPEN_ID_URL ?>" />