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In page Parliament of the United Kingdom:

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The foremost privilege claimed by both Houses is that of freedom of speech in debate; nothing said in either House may be questioned in any court or other institution outside Parliament.[citation needed] Another privilege claimed is that of freedom from arrest; at one time this was held to apply for any arrest except for high treason, felony or breach of the peace,[citation needed] but it now excludes "only to civil proceedings, cover[ing] all offences... [and] protect[ing] MPs only from arrest and imprisonment", and applies during the session of Parliament, and 40 days before or after.[1] Members of both Houses are no longer privileged from service on juries.[2]