[4] An internal BP investigation cleared him of "serious neglect or intentional misconduct" but said he should have taken more steps to consider and mitigate the risks long before the disaster occurred, and criticised several aspects of his conduct.

[2] During his time at Talisman the company focused on shale gas, selling a non-controlling stake in its North Sea business to Sinopec in July 2012.

[17] In July 2015, the United States Environmental Protection Agency reported that it had fined Talisman Energy $62,457 for more than fifty health and safety violations at sites in Pennsylvania.

[18][19] In February 2014, Manzoni joined the British civil service as the chief executive of the Major Projects Authority, a role under the remit of the Cabinet Office.

[26] As chief executive of the civil service, Manzoni resigned from his positions at Leyshon Energy and Adamant Ventures but continued to serve as a director for SABMiller, for which he was criticised by MPs including Sarah Wollaston, then a Conservative MP serving as chair of the health select committee, as a conflict of interest given SABMiller's opposition to minimum alcohol pricing.

[21] In 2015, Manzoni told a conference of the FDA trade union that civil service roles didn't need as much pay as they were more interesting than the private sector.

[29] Manzoni's position of chief executive was initially a five-year appointment, but was extended until April 2020 for continuity with changes in government following the 2019 United Kingdom general election.