I am a member of an AAC SIG the link is here aacsig.org.uk. I believe there is one in London too. This is a mixture of complex needs, high tech and low tech AAC and not just for AAC for young Autistics children. I have worked with a few children on with ASD using high tech AAC and I would really value CPD time to discuss difficulties that arise. it can be tricky figuring out the best for them and sometimes you just need a similar-minded therapist to bounce ideas. I would be interested in meeting with you.