Hudson will be replaced by a new director of comms in May, at which point he will take a post promoting the FCO's four new policy goals across the globe.
Hudson will promote the four goals - tackling climate change, terrorism, conflicts, and developing international systems - to governments, businesses and non-governmental organisations. Hudson added that the Middle East would be one focus. The role lasts for four months and is part of the FCO's plan to have more influence overseas.
Hudson has made no decision on what he plans to do after the assignment, but said he does not plan to leave PR. The interview process for the director of comms role is ongoing.
Meanwhile, FCO energy adviser Rob Sherwin is to join reputation risk management consultancy Regester Larkin as MD of its United Arab Emirates office.
Based in Dubai, Sherwin will use his experience at the FCO and Shell to build contacts within the Middle East.