From April 2014, NHS England will be responsible for funding specialised AAC services in England. These services will provide assessment, training and equipment for children and adults with complex communication needs.
You can download the latest (March 2014) draft service specifications (link below), which the specialised services will be working towards during 2014-5. These service specifications will be ratified by NHS England in October 2014.
The service specifications define the remit of the specialised services, as well as the criteria for referral to these services. They also describe the close collaboration between the specialised and local services.