Some federal parliamentarians plan to travel to Britain to visit jailed WikiLeaks founder Julian Assange, who the organisation's editor-in-chief, Kristinn Hrafnsson, says is in poor health and "losing weight rapidly".

Independent MP Andrew Wilkie, who co-chairs a group of parliamentarians working to bring Mr Assange home, said the MPs hoped to meet with Mr Assange, his legal team and British parliamentarians during the trip early next year.

Independent MP Andrew Wilkie says there is growing parliamentary interest in Julian Assange's plight. Credit:AAP

Mr Assange is being held in a high-security London jail as he battles the United States' efforts to extradite him to face espionage charges.

He has attracted support from a diverse group of political figures, including former prime minister Kevin Rudd, former deputy prime minister Barnaby Joyce and Greens senator Peter Whish-Wilson. Controversial Queensland MP George Christensen co-chairs the Parliamentary Friends of the Bring Julian Assange Home Group with Mr Wilkie.