>You can also use SOAP headers for this. But again - quite awkward to implement.

I had it ok. I just needed to encode the XML that I am returning as a parameter.

So, basically, a normal process will, eventually, get into the WebService method to return the response. However, in the entry code, one which is executed before each WebService method, if I need to intercept the call, I just switch it off to System.Web.HttpResponse:

' Intercept the execution
Public Function InterceptExecution() As Boolean
   Dim loHttpResponse As System.Web.HttpResponse = Nothing

   loHttpResponse = System.Web.HttpContext.Current.Response
   loHttpResponse.Clear()
   loHttpResponse.ClearContent()
   loHttpResponse.ClearHeaders()
   loHttpResponse.ContentType = "text/xml"
   loHttpResponse.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8")
   loHttpResponse.Write(cXml)
   loHttpResponse.End()

   Return True
End Function

The cXml property is constructed from a SOAP envelope:

' Return a XML response with a full SOAP envelope
Public Function GetXmlSOAPEnvelope() As String
   Dim lcSOAP As String = ""
   Dim lcXml As String = ""

   ' Get the Xml
   oWebServiceClient.lSuccess = lSuccess
   oWebServiceClient.lEncode = True
   If oWebServiceClient.GetXml() Then
   End If

   ' Initialization
   lcXml = oWebServiceClient.cXML

   lcSOAP = lcSOAP + "<?xml version=""1.0"" encoding=""utf-8""?>"
   lcSOAP = lcSOAP + "<soap:Envelope xmlns:soap=""http://schemas.xmlsoap.org/soap/envelope/"" " +
    "xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" " +
    "xmlns:xsd=""http://www.w3.org/2001/XMLSchema"">"
   lcSOAP = lcSOAP + "<soap:Body>"
   lcSOAP = lcSOAP + "<" + cMethod + "Response xmlns=""http://tempuri.org/WebService/Service1"">"
   lcSOAP = lcSOAP + "<" + cMethod + "Result>"
   lcSOAP = lcSOAP + lcXml
   lcSOAP = lcSOAP + "</" + cMethod + "Result>"
   lcSOAP = lcSOAP + "</" + cMethod + "Response>"
   lcSOAP = lcSOAP + "</soap:Body>"
   lcSOAP = lcSOAP + "</soap:Envelope>"

   Return lcSOAP
End Function

The oWebServiceClient is simply a class which define a proper protocol for returning the Xml based on our standards.

Thanks for the response