In this section...
http://pecs-unitedkingdom.com/pecs.php - information on PECS, this link takes you directly to the link which talks about PECS and what it is.
https://www.makaton.org/aboutMakaton/ - information on Makaton and what it is.
Communication Matters is a website dedicated to a range of communication methods for students with a range of disabilities and is well worth a look for any of the parents within the school.
http://assistivetechnology.about.com/od/AugmentativeCommunication/tp/Top-10-Alternative-And-Augmentative-Communication-Aac-Apps.htm - this is a link to a list of IPad Apps for students who may benefit from communication apps on an IPad. For students who have a concept of pictures/symbols. (All need to be paid for)
http://praacticalaac.org/praactical/updated-59-free-or-lite-versions-of-aac-apps/ - this is a link to a list of IPad Apps for students who may benefit from communication apps in their lite or free form. Parents may like to try to see if they are suitable.
http://www.totalcommunication.org.uk/objects-of-reference/ - for PMLD students here is a simple explanation of objects of reference for the parents and what they are.