The system sucks that's for sure. The project I'm currently working on is for parents in the US, but I don't see why it wouldn't work for parents in the UK. The idea is the same, although I don't know about the politics of autism in the UK.
Also I realize that I could have given some more info on apraxia. One thing I've had to do with my apraxia kids is a speech therapy program built into their ABA program. A good ABA program should do this anyway along with occupational therapy or sensory needs. But for apraxia much more needs to be done.
I've had two cases of severly apraxic and moderate to severe autism cases (with less severe cases you shouldn't have to start as this basic approach).In both of these we had to start with oral motor activities such as horn blowing and bubble blowing (not having them blow bubbles themselves, but us blowing bubbles catching them on the wand and having them try to pop the bubble or blow it away with their own air production).
We also did exercises with their face and tongue to get their mouths ready to do the activities. Such as tongue lateralizations, lip stretches, facial massages, etc. This warms those muscles up and gets them ready to perform. Then we would have them blow on a horn. The horn therapy comes in a system and once they master one level a harder one is introduced.
We also physically manipulate their mouth into the correct position to make the sound. This is basic and first such as giving them a physical prompt in where to place their lips and/or tongue. In severe apraxics this is helpful, it gives them a oral "memory" of what they should be doing. So they don't have to naturally recreate the sounds just by listening, in the beginning anyway.
Maybe this description is more helpful. I don't know many speech therapists who do this, but this is the only technique i've seen to be effective. It's messy work, but you have to get in their mouths.