Alasdair Taylor's Answer

There’s not enough information here to say more than “consult a solicitor, preferably (if there is one) a solicitor who is advising you on any divorce proceedings”. For example, there could be an actionable breach of confidence. But to be sure whether there is one, you either need to get proper advice from someone in possession of all the facts, or do a lot of research yourself about the law and how it applies to the facts. If you do have a cause of action, then the next steps would usually be: (a) a letter threatening court proceedings unless the other party complies with your demands; and/or (b) the issue of court proceedings. But again, you would either need a solicitor or to put yourself in a position to do the solicitor’s job.