Be very, very careful with these people. The UK has faced a lot of scrutiny for how they handle child protection cases. They've been accused on many occasions of falsifying reports, taking children from their parents, then adopting those kids to other people.

I would seriously research how to best handle this situation and do whatever you can to get them off your case. I would not react emotionally. Unfortunately, I don't know whether fighting or complying would be best. It's good that it hasn't turned into a child protection case yet, but take it seriously and do what you can to get them out of your life.