A climate campaigner said Morgan’s new roles at the bank would be “hypocritical and selfish” unless she pushes Santander to completely phase out its funding of fossil fuels.

May has called on fellow Conservatives to unite behind the government’s climate plans amid backbench opposition - but her own record is mixed.

DLA Piper, whose clients have included Shell, ExxonMobil, and BP, will provide legal services to the UN climate change summit.

The criticism comes despite COP26 President Alok Sharma insisting that the summit would be an "inclusive" event, with “all voices” heard.

Climate activist group Extinction Rebellion is currently protesting against the funding of coal, oil and gas projects around the world by London’s financial sector.

Former UK Prime Ministers David Cameron and Theresa May both lobbied the Bahraini government on behalf of Petrofac, whose co-founder is a major Conservative donor.

The environmental protest group has said it wants to highlight the role of the City of London in financing fossil fuels around the world.

Brendan Clarke-Smith has “no credibility” on climate change after “conflict of interest” is revealed, say critics.

Climate campaigners are set to descend on the City of London for two weeks, starting on Monday.

UK outlets have some of the most accurate climate change reporting compared with other English-speaking countries, a study has found - and also some of the least.