...speak to the SENCO about DD2.
I phoned audiology to make sure that DD2 was referred. They said that she missed an appointment on 9th April
but they kindly rearranged as we didn't get the letter.
I then spoke to SALT, who said that we wouldn't see the SALT because it's all through school, so I needed to speak to the SENCO (something that I wanted to avoid through fear of being labelled neurotic after our last experience).
So...I phoned the school, asked to speak to the SENCO. I was meant to simply enquire as to whether I could speak to the SALT after she'd seen DD2. Instead, she asked me how she was referred and why? I ended up pouring out all our concerns.
She was interested and said that she could see why I was so concerned, and would like copies of 'everything I have' on DD2 
She's taking me seriously! And, she sent an email chasing the SALT while I was on the phone to her.