What evidence is needed for proof of unreasonable behaviour for grounds of divorce?

What is unreasonable in a marriage varies from relationship to relationship, so it is impossible to tell you what evidence is required for your specific situation. In general, some of the incidents of unreasonable behaviour cited in Statement of Particulars include arguments over finances/children/parents, incidents of family violence, coming home late or improper relationships with unknown third parties. Types of evidence include audio or video recordings, WhatsApp messages, witness accounts by children, friends and family members etc.