Phoned the family & placement team and got the ball rolling! Spoke to the duty social worker and was on the phone for about half an hour. They are sending out the information pack and then we need to phone and arrange a SW visit.
The next set of information days are in September and if that goes ok we can start the assessment in the autumn.
Can't believe after years of discussion I've made that call. DH is as excited as me 
I'm well aware my childhood is going to be scrutinised but maybe I will finally get the truth that my mother refuses to disclose (there was SW involvement when I was preschool due to my mothers involvement with drug addicts).
Anyway SW was lovely today and explained they aren't trying to catch us out but ensuring that I'm able to deal with the challenges that an AC brings. Have two BC already but feel stupidly excited about this