The judge in Bruce Lehrmann's defamation case ordered Sky News to release an alleged secret recording of a conversation between Brittany Higgins's lawyer and fiancé.

The conversation reportedly showed the pair discussing Higgins's cross-examination while she was still testifying.

Australian correspondent Murray Olds says this is the latest development in a long and costly investigation.

LISTEN ABOVE

• Bruce Lehrmann defamation trial: Brittany Higgins cross-examined in court appearance
• Explosive text exchange shared between barrister and prosecutor in Bruce Lehrmann case
• Australian DPP Shane Drumgold walks back claims about Bruce Lehrmann trial inquiry