I should really appreciate some help here.
STBXH is financially / emotionally / psychologically damaging / abusive.
DC visit EOW / half of half term (they're with him now 
) and DC1 is suffering from anxiety (and having counselling) because of odd / unnatural / cruel behaviour exhibited by his DF. DC1 is not the golden child, I removed STBXH from FMH as he favours one DC over the other.
I see that in the USA you can request a "custody evaluation" which includes a psychological profiling of both parents (individually). This would be extremely helpful as I believe it would provide proof of STBXH profile (I thought he had ASD / Aspergers, now with hindsight and a lot of therapy myself we believe him to be a pathological liar, narc / sociopath, bordering on psychopath. He used to seek to hurt my DDog, and laugh at him when he reacted by biting him).
Is this type of profiling available in the UK? Am I going to have to sell an arm and a leg to pay for it? AIBU to think that to prove emotional / psychological abuse it is - as stated in the article below - like fencing with a ghost, you know it is there but there is no physical, tangible proof? I know there are people out the fighting for this to become legislative procedure but how can it be proven?
info.legalzoom.com/prove-emotional-child-abuse-custody-26797.html