OK, sorry for the delay, I've got this near the top of the file -
$old_shipping = $_SESSION['shipping'];
$_SESSION['shipping'] = (zen_not_null ($_POST['shipping'])) ? zen_clean_html ($_POST['shipping']) : '';
and later I have -
// handle shippin method change
if (($_SESSION['shipping']) != $old_shipping) {
$checkout_one->debug_message ('NOTIFY_CHECKOUT_ONE_CONFIRMATION_NO_SHIPPING');
zen_redirect (zen_href_link (FILENAME_CHECKOUT_ONE, '', 'SSL'));
}



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