Ellen Johnson Sirleaf, the president of Liberia, is urging MPs to back a bill banning vulture funds from using British courts to prey on poor countries when it comes to a vote on Friday. Liberia lost a $20m (£13m) case in London last year against two so-called vultures. Such funds buy up the loans of poor governments, wait for them to win from the international community, and then use courts to pursue the countries for assets.