I cannot go into too much detail on here in case someone recognises the situation, but generically this is the situation.
Person A has residence of a child.
Person A lives with a partner.
Person B is the other parent of the child and lives 200 miles away with their spouse (used to have residence of the child when they lived nearer)
Person B receives an 'out of the blue' message from the partner of Person A advising that they are going to leave Person A because of their abusive behaviour towards them and the child and that there is no way they could leave the child in Person A's care when they do.
Person B two days later receives a call from social services asking intrusive questions about Person A.
Person B is now extremely worried about the welfare of their child and is considering their options as Person A has a child arrangement order giving them residence and Person B cannot afford to take Person A to court for residence.
Is there anything Person B can do other than find the cash to go to court?