File photo dated 13/03/14 of Lord Gus O'Donnell, who has warned that a Brexit deal will take at least five years to hammer out as he told senior ministers to stop "briefing against each other".

- Image ID: HE8TH9
File photo dated 13/03/14 of Lord Gus O'Donnell, who has warned that a Brexit deal will take at least five years to hammer out as he told senior ministers to stop "briefing against each other".
PA Images / Alamy Stock Photo
Image ID: HE8TH9

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