NuSOAP Error without WSDL

Hi All I'm having a problem I don't understand. I can request web services on a server using a wsdl url and a standard service url, for example: http://www.myurl.co.uk/service/soap/1.0/ http://www.myurl.co.uk/schemas/service/1.0/ContentProviderAPI.wsdl In Java, calling the non-WSDL service works perfectly. With PHP I can get the WSDL version working but when I try to get the other method working which is what I want - I get the following error: Code: ns0:Server.UnexpectedException String: SOAP deserialization error: No WSDL:Port has been found for the SOAP operation {http://testuri.org} getCustomerID What is this? My code is as follows: Code: ns0:Server.UnexpectedException String: SOAP deserialization error: No WSDL:Port has been found for the SOAP operation {http://testuri.org} getHandsetLocation $client = new soapclient($url); // url is the first option above // using this line - it works with url 2 above: $client = new soapclient($url, true); $client->username = 'user'; $client->password = 'pass'; // initialise parameter list $param = array('sessionID' => "$123"); // call the getCustomerID() function, passing the parameter list $response = $client->call('getCustomerID', $param); // handle any SOAP faults. if ($client->fault) { $str_result = "ERROR: <br>Code: {$client->faultcode}<br />" . "String: {$client->faultstring}"; } else { // make sure a value was returned if ($response == "") { $str_result = "ERROR: No value returned."; } else { $str_result = "Customer ID: $response"; } } I really don't understand this - any ideas? Thanks Matt