Fixed fatal error on D7
Error: Class 'Drupal' not found in civicrmpostcodelookup_civicrm_buildForm() (line 119 of /var/www/html/drupal7/sites/default/files/civicrm/extensions/conrib/ukpostcodes/civicrmpostcodelookup.php).
Error: Class 'Drupal' not found in civicrmpostcodelookup_civicrm_buildForm() (line 119 of /var/www/html/drupal7/sites/default/files/civicrm/extensions/conrib/ukpostcodes/civicrmpostcodelookup.php).