The five grounds for divorce can no longer be relied on - but they were required by law until very recently. The possible grounds were:
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adultery - where your spouse has had sexual intercourse with someone else of the opposite sex
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unreasonable behaviour - this can include serious accusations including domestic violence or drunkenness, as well as rather vague issues such as lack of support in maintaining a household
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living apart for more than 2 years (with agreement)
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living apart for more than 5 years (without agreement)
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desertion - if your spouse left you, without your agreement or a good reason and with the intention of ending the relationship
In practice, divorcing couples who both wanted to get divorced would often choose 'unreasonable behaviour' as a catch-all ground. In reality, there was a very low standard for what qualified as unreasonable behaviour.