I did it! After 5 years off pushing it away in the hope visits will do nicely I have made a claim to csa. He won't visit DD. Hasn't paid maintenance ever. So he can start now.
I'm shitting bricks though. I know what abuse will come my way from him, wife to be and her friends. The man I spoke to from csa advised me to ignore any abuse or conversations with ex, wife to be and her friends because it's now in csa's hands. Yes I made the call. But the steps taken now aren't made by me I.e. Sending the letters etc. So that is what I shall (attempt) to do.