Murray Olds: Australian correspondent on Bruce Lehrmann ordering Sky News to produce alleged recorded conversation between Brittany Higgins's lawyer and fiancé - Heather du Plessis-Allan Drive

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.

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