Hundreds of political activists will gather in London on Saturday to protest a controversial EU-US trade agreement campaigners warn will enhance corporate power, and promote the privatization of vital public services.

The trade deal, known as the Transatlantic Trade and Investment Partnership (TTIP), is currently being negotiated behind closed doors in Brussels. It has been the subject of heated criticism among academics, campaign groups, austerity campaigners and economic policy activists across the globe.