Sorry just to add if I was a sw I would definitely record - and yes much quicker to do meeting notes from audio and surely touch typing is a must for such a role ... but I have missed the point of the thread.
If I was getting investigated I would:
Make sure the house was spic and span. Much like I like having the house ready for visitors.
Make sure fridge was full.
Make sure Kids were bathed and in pjs reading or doing some quiet crafts - just like I would if I had a visitor at night.
Make sure they had been fed.
I would record the conversation
I would have a witness with me
I would be pleasant but if for example I suffered from anxiety I would not at all raise it.
I would be honest but not more open than I felt necessary.
Why? I am sure social workers are just like others, some are good, some are excellent, soon are poor and some will be dreadful.
And then when they left I would listen to the recording with my adult witness and talk though it and then I would relax and be glad it was over.
I would also be quite particular with the school in that I would make sure teeth were cleaned, uniforms ironed and children arrived on time etc because I would never ever want to go through a referral again.
Obviously I would understand that social workers do a very important and powerful job as they can change lives and protect children.