London: Ecuador's ambassador in London has met a British Foreign Office minister and expressed concern over the government's position on Julian Assange.

Carlos Abad​ spent more than an half an hour with MP Hugo Swire discussing the case of the WikiLeaks founder, who has been staying at the Ecuadorean embassy in London for more than three years.

WikiLeaks founder Julian Assange speaks from the balcony of the Ecuadorian embassy last month. Credit:Getty Images

The Australian is wanted for questioning in Sweden over sex allegations, which he denies, but believes if he goes he will be extradited to the United States over the activities of WikiLeaks.

Tuesday's meeting was the first time Ecuador approached the British government since a United Nations working group said it believed Mr Assange was being "arbitrarily detained".