Voice recorder issue. Is it legal to record my wife? UK law.

Any lawyers out there? My wife and I are divorcing. She has been having an EA via facebook for a while now. It just got physical. She went to stay with him for two weeks before returning to this house. She's going again soon and again at Christmas. He lives abroad. I placed a voice recorder in her room and discovered that the relationship is much more serious than she is letting on. There is talk of marriage and children so they intend to live together. She has a well paid job as does the lover. He also owns his home. However, this is not how she is presenting it. Instead she is asserting that they have no long term plans and that she will have to support herself after the divorce and is forcing the sale of the house despite it being a premarital asset owned outright and mortgage free by me for years before we were married. The recording proves otherwise. What their plans are has an affect on the settlement. So does anyone know if the recording legal and can it be used as evidence of their plans to cohabit? Many thanks to anyone who can help.

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