São Tomé and Príncipe heads to polls in tense presidential election

<p>Incumbent Carlos Vila Nova hopes to defeat his former party and secure second term as independent</p><p>Voters in <a href="https://www.theguardian.com/world/sao-tome-and-principe">São Tomé and Príncipe</a> go to the polls for a presidential election on Sunday as one of Africa’s least populous countries seeks to burn