diff --git a/booking.variety_admin.inc b/booking.variety_admin.inc
index b84d191..708af98 100644
--- a/booking.variety_admin.inc
+++ b/booking.variety_admin.inc
@@ -765,26 +765,67 @@ function booking_variety_regn_edit_form_submit($form, &$form_state) {
       array(':nid' => $values['nid']))->fetchObject();    
     $previous_variety_ids = drupal_json_decode($person->booking_variety_ids);
 
+    // iterate over the new list comparing to the old list
     foreach ($booking_variety_ids as $new_tid => $new_sid) {
-
       //check if there was a previous session ID for this person in this timeslot
       if (! isset($previous_variety_ids[$new_tid])) {
         watchdog('booking_debug', 'Person @nid in timeslot @tid had no previous session id registered but is now @new.', array(
-          '@nid' => $values['nid'], '@tid' => $new_tid, '@new' => $new_sid));              
+          '@nid' => $values['nid'], '@tid' => $new_tid, '@new' => $new_sid));
+          
+        // increase regn count for new session                               
+        db_update('booking_variety_sessions')
+          ->expression('booking_variety_regncount', 'booking_variety_regncount + :count', array(':count' => 1))
+          ->condition('vid', $new_sid)
+          ->execute();          
       }
       else {
+        $previous_sid = $previous_variety_ids[$new_tid];
         //compare session id in this timeslot to the previous value
-        if ($new_sid != $previous_variety_ids[$new_tid]) {
+        if ($new_sid != $previous_sid) {
           watchdog('booking_debug', 'Person @nid in timeslot @tid previously registered for session id @vid but new value is @new', array(
-            '@nid' => $values['nid'], '@tid' => $new_tid, '@vid' => $previous_variety_ids[$new_tid], '@new' => $new_sid));      
+            '@nid' => $values['nid'], '@tid' => $new_tid, '@vid' => $previous_sid, '@new' => $new_sid)); 
+
+          // if variety session has changed then update the counts for old and new
+          if ($new_sid != $previous_sid) {
+            // reduce regn count for old session          
+            watchdog('booking_debug', 'Person @nid in timeslot @tid is no longer registered for variety session @vid so reducing count by 1', array(
+              '@nid' => $values['nid'], '@tid' => $new_tid, '@vid' => $previous_sid));
+            db_update('booking_variety_sessions')
+              ->expression('booking_variety_regncount', 'booking_variety_regncount - :count', array(':count' => 1))
+              ->condition('vid', $previous_sid)
+              ->execute();  
+
+            // increase regn count for new session            
+            watchdog('booking_debug', 'Person @nid in timeslot @tid is now registered for variety session @vid so increasing count by 1', array(
+              '@nid' => $values['nid'], '@tid' => $new_tid, '@vid' => $new_sid));        
+            db_update('booking_variety_sessions')
+              ->expression('booking_variety_regncount', 'booking_variety_regncount + :count', array(':count' => 1))
+              ->condition('vid', $new_sid)
+              ->execute();            
+          }
         }
         else {
           watchdog('booking_debug', 'Person @nid in timeslot @tid has not changed variety session @vid', array(
             '@nid' => $values['nid'], '@tid' => $new_tid, '@vid' => $new_sid));              
         }
       }
-
     }
+
+    //iterate over the old list comparing to the new list in case there are regn counts we need to decrease
+    foreach ($previous_variety_ids as $previous_tid => $previous_sid) {
+      if (! isset($booking_variety_ids[$previous_tid])) {
+        watchdog('booking_debug', 'Person @nid in timeslot @tid is no longer registered for a variety session so reducing count for @vid by 1', array(
+          '@nid' => $values['nid'], '@tid' => $previous_tid, '@vid' => $previous_sid,
+        ));
+        // reduce regn count for old session
+        db_update('booking_variety_sessions')
+          ->expression('booking_variety_regncount', 'booking_variety_regncount - :count', array(':count' => 1))
+          ->condition('vid', $previous_sid)
+          ->execute();          
+      }
+    }
+
+
 /*
     foreach ($previous_variety_ids as $previous_tid => $previous_sid) {
       if (! isset($booking_variety_ids[$previous_tid])) {
@@ -828,7 +869,7 @@ function booking_variety_regn_edit_form_submit($form, &$form_state) {
         }
       }
     } //end iterate over previous variety session registrations
-
+*/
     // update the session registration information for this person
 		$result = db_update('booking_variety_regn')
 			->fields(array(
@@ -837,7 +878,7 @@ function booking_variety_regn_edit_form_submit($form, &$form_state) {
 			->condition('booking_person_nid', $values['nid'])
 			->execute();
     watchdog('booking', "Updated variety session registration for person ID !nid", array('!nid' => $values['nid']));
-*/
+
 		$form_state['redirect'] = $redirect_path;
 	}
 }