You'll get the hang of it here
It's good to get the whole story in one place so others can follow.
About to dash off, so will try to post more later.
I did want to mention the MMPI-2 is a psychiatric eval used here in the U.S. It might be worth looking to see if it's applicable in the U.K.
You were able to get very limited supervised visitation for him, which is remarkable. Here in the U.S., status quo goes a long way. Judges tend to need substantial circumstances to demonstrate why any changes should be made. Does it work that way where you are, too?
Also, is your ex representing himself? That can be a blessing. My ex (former trial attorney) represented himself and went in and out of psychosis on a few occasions. That made for some pretty interesting moments in court.
My ex is no longer in our lives, he faded away. It is variable, but anecdotally, it does seem that men with BPD tend to fight to *win* but don't actually seem to want the actual visitation, though I don't want to give you any false hope.
My ex was very besotted when our son was born, but would lose interest quickly when things became stressful.
A good rule of thumb here in the US is to go into family law court with a solution so that you aren't letting the judge decide. "Ex has managed well with 2 x 1 hr supervised contact for the past x months, only missing x visits (if any). The limited visits are because of abc, and for the visitation to be extended, I respectfully ask the court to have ex undergo a psychiatric evaluation/anger management/substance abuse (or whatever) before expanding these visits.