James Mawdsley was arrested last August for distributing anti-government literature and entering Burma illegally. He has been kept in solitary confinement in Kengtung prison, 400 miles north-east of the capital, Rangoon.
The cage, with a banner calling for an end to the genocide against ethnic minorities by the Burmese junta, will be presented to the embassy by David and Diana Mawdsley, who will also hand in a letter calling for the Burmese government to respect human rights.
The letter, signed by Lord Alton, David Amess, Tory MP for Southend West, and the Bishop of Liverpool, the Right Rev James Jones, calls for the international community to act to end the "barbaric" genocide of the junta, believed to have murdered more than 30,000 Karen people.
The Jubilee Campaign, the Christian pressure group which is backing the Mawdsleys, has also sent 5,000 alternative Valentine's Day cards to, among others, the foreign secretary, Robin Cook, to alert them to the fate of ethnic minorities in Burma.
