Hi

thank you for your suggestions. I found the error in includes/templates/YOUR_TEMPLATE/templates/tpl_login_default.php on line 196

The line read: - <span class="fec-fieldset-legend"><?php echo HEADING_NEW_CUSTOMER_SPLIT; ?></span>

I changed this to <span class="fec-fieldset-legend"><?php echo HEADING_RETURNING_CUSTOMER_SPLIT; ?></span>

Now the "new customer" has been replaced with the words "returning customer"

Thank you for your help

Justin