Lloyd's brokers have come under fire for providing insurance in Myanmar [formerly Burma], which has a shocking reputation for human rights abuse.
The exiled general secretary of the Federation of Trade Unions in Myanmar, Maung Maung, has called on the British insurance industry to cease doing business with the country.
Lloyd's brokers arranged cover for Myanmar's ports, allowing it to export goods to the rest of the world.
Broker Willis has already been blacklisted by an international union organisation for its links with Myanmar.
The International Confederation of Free Trade Unions warned that Willis risked becoming an accomplice to forced labour. It is understood that Willis' Singapore office provides insurance cover for companies investing in Myanmar.
Last year Lloyd's appeared on the Burma Campaign's so-called 'dirty list', showing firms that directly or indirectly help finance Myanmar's brutal military junta.
The Burma Campaign was founded in 1991 aiming to restore human rights and democracy in Myanmar.
In March Aon Corporation said it would terminate all business in Myanmar when it too was named on the list. Its name has since been removed.
A Lloyd's spokesperson said: "We have a robust system to ensure that the market only does business where it is legal to do so, and that any sanctions - where they exist - are properly enforced. Ultimately, it is up to businesses in the market to decide where their business comes from."
Willis was unavailable for comment.