<?php
if ( $Lead_Source[] == "TD Scotland"){

    include_once("IVA-pdf.php");

} elseif($Lead_Source[] == "IVA Compare"){

    include_once("TD-direct-pdf.php");

} elseif ( $Lead_Source[] == "Debt Advice Company"){

    include_once("debt-advice-pdf.php");

} else ( $Lead_Source[] == "Trust Deeds Direct"){

    //load another pdf creator file
}

?>