Carney steps down from the BoE in March and has already accepted a role as a U.N. envoy on finance and climate change, taking over from former New York mayor Michael Bloomberg, who is running to become the next president of the United States.

"His expertise will help the UK to lead in mobilising businesses and investors to support our net-zero revolution," Johnson said in a statement after a meeting with Carney.

(Reporting by David Milliken; editing by Stephen Addison)