I'm sorry this isn't turning out as you hoped OP, but maybe I can shed some light on why they show the full statement.
A year or so ago my neighbour made allegations to SS about me. They were completely fictitious, batshit crazy, we have no idea who it was as none of it made any sense.
Our SW was a nightmare though. She trickled the information in a little at a time, and I was trying to make sense of it, see what kind of misinterpretation the person who called in had made. I didn't see the whole statement until it came with the follow up letter.
For instance the SW told me they had heard that my son was sat in his high chair a lot. I explained that he liked to take his time to eat and explore his food, so yes, he could be in for a while at a time, but he was fine. What the actual report said was that he was left, in his high chair, alone in the conservatory for hours on end. Had I been told that I could have immediately pointed out that a) the high chair was never in the conservatory, and b) if it was, there was no vantage point from outside our garden where it would be visible. I could have discredited the whole set of allegations straight away in the first visit because it was physically impossible for them to have seen what they said they did. As it was we had 3 very intrusive visits from a very obnoxious SW before her boss closed the file as we were clearly just fine.
Obviously in your case there is a serious problem, there will be a follow up visit, they will also talk to the childrens' HV, doctor, nursery etc, but every family under investigation needs to know exactly what they are being investigated for. Otherwise the authorities could investigate anyone, for any undisclosed reason, and they would have no way of defending themselves.