There may be no honour among thieves, but things can be pretty fierce among consultants too. The credibility and credentials of global consultancy giant McKinsey&Co (known to its staff as ‘The Firm’) have been taking a battering lately and it has not taken long for competitors to sniff the opportunity.

McKinsey has been the leading provider of advice on how to reduce carbon emissions from deforestation and degradation of forests (REDD), retained to advise on national plans for Indonesia, Papua New Guinea and the Democratic Republic of Congo among others.