CSA might be a good place to start as they can provide mediation

They gave me a phone number for a local family/relationship group who assist couples come to custody agreements...if it needs to go further they can provide all the contacts for the family court.

rest assured that family law has changed a lot from what it used to be and they highly favor shared custody of kids these days... unless he is a drunkard, on drugs or abusive, he would not be denied some percentage of custody.

all the best.