The SDMT developed by HCD will continue to be available.  
It has been moved to the following address : http://v1.cypmh-model.nhs.uk/ . 

You should be able to access all your saved models and use the same access credentials that you have previously used (username / password).  

There are no new features or functions planned for the SDMT, we will be focussing on developing the new tool (CReST) to incorporate the key features.