Hi Sam,
The web service is valid following are details of testing on various tools.
SOAP UI: basichttpbinding works fine for wshttpbinding receiving Internal Server error in log and Response as The security context token is expired or is not valid.
MII Web Service Action Block: basichttpbinding works fine for wshttpbinding not able to configure url through wizard because as per my discussion with other MII experts MII does not support SOAP1.2. that is one reason for using http post.
WCF Storm: both bindings works fine (There is option to select windows authentication and Impersonation level as delegation)
WCF Test Client: Both bindings works fine
Please let me know if additional details required.
Thanks & Regards,
Manoj Bilthare