Mr Tsege, a co-founder of the Ginbot 7 opposition movement, spent four years in prison after being accused of plotting a coup against the Ethiopian government. He was sentenced to death in 2009.
After being pardoned in May 2018, Mr Tsege held a 90-minute meeting with Ethiopia’s Prime Minister Abiy Ahmed, who has introduced a series of reforms since taking office in April.
British passport-holder Mr Tsege has subsequently re-joined his family in London.