In the United Kingdom:
Is it legal to secretly audio record a meeting (in an office) or a phone call while being a participant?
Is it possible to use such recording as an evidence in court or employment tribunal?
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To preface my answer, this aspect of UK law is unclear at best and I try to set out general principles where available.
It is a general principle that conversations recorded without consent are inadmissible in court, particularly in terms of a criminal proceedings. In civil matters, it similarly follows the concept that a claimant should come to court with clean hands. However, judges are usually more pragmatic in civil cases and if parties are aware of the existence of the recording, then it often be subject to usual rules of disclosure, though this may open the creator of the recording to subsequent litigation regarding the illegality of the recording under Data Protection Act or others.