Documents contain WhatsApps with senior government ministers, emails between officials, and handwritten notes from Lord Mandelson, who described No10 as 'beleaguered and bereft'

Cabinet Office is expected to publish more than 1,000 pages related to former US ambassador’s appointment to role

More than 1,000 pages of information will reportedly be released on Monday and could contain embarrassing private exchanges between top ministers and the sacked diplomat

Ministers were braced for embarrassing revelations ahead of the publication of the files on Monday afternoon