British rockers Supergrass will top the bill at a London concert to raise money for anti-slavery charities - hosted by Hollywood stars Rhys Ifans and Samantha Morton. The event has been organised to raise awareness and funds for a number of causes dedicated to stopping slavery and people trafficking. The Voice of Slavery will take place at The Forum in London's Kentish town on 25 March (07) and will be compered by Ifans, Morton and Sadie Frost. The date marks the 200th anniversary of British parliament abolishing trans-Atlantic slavery.