Thanks aeh, your post was very helpful. I did have a talk with his current therapist before reading your post. She said exactly what you did about therapy vs practise. She said there is nothing else she can teach him cognitively at the moment as he knows it all. But he needs to practice.

I spoke to the speech pathologist who would be taking over sessions as well. She seems like a capable young woman, and she probably has something to offer DS, but we think we might take the change as an opportunity to take a break from therapy and work with the school and their support team to see if we can set up sufficient support there. School is where he spends most of his time, so it would be the ideal place for him to practice, but there is the risk that the support will not be consistently implemented. I think it is worth a shot though. I will talk to his current therapist at his last session next week, and see what goals she would recommend.

Thanks again everyone who has taken the time to respond. It is much appreciated.