Lacuna is “an online magazine that exposes injustice and promotes human rights.” They specialize in environment, equality, politics, migration, food poverty, and conflict. They “welcome unsolicited submissions and proposals from both new and established writers.” They publish features of at least 3,000 words and shorter essays of 1,500 to 3,000 words. One payment report indicates payment of £400 for a 3,000-word piece. For details, visit this page.