According to PoliticsHome:
Claims that John McDonnell will not have to kneel when he joins the Privy Council have been dismissed by sources close to the ancient advisory body.
Mr McDonnell was approved by the Queen as a privy counsellor yesterday and will take part in the swearing in ceremony in the coming days.
In April it emerged he once joked that he was “looking forward” to seeing papier-mâché models of the Royal Family publicly executed in a way to “balance out the coverage of the Royal Wedding” in 2011.
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