Stuart,
If you or anyone else is looking for a solution to this problem here's what I did.
First get this script: http://www.phpclasses.org/browse/download/zip/package/3509/name/php2wsdl-2009-05-15.zip
Then look at its example files. After that I just sliced it the way I needed because I'm using codeigniter:
function wsdl(){
error_reporting(0);
require_once(APPPATH."/libraries/WSDLCreator.php"); //Path to the library
$test = new WSDLCreator("Webservice", $this->site."/wsdl");
//$test->includeMethodsDocumentation(false);
$test->addFile(APPPATH."/controllers/gds.php");
$test->addURLToClass("GDS", $this->site);
$test->ignoreMethod(array("GDS"=>"GDS"));
$test->ignoreMethod(array("GDS"=>"accessCheck"));
$test->createWSDL();
$test->printWSDL(true); // print with headers
}
That it, your all done.
Btw, I'm using SoapServer and SoapClient in php5+