Three well-known online publishers – The Bureau of Investigative Journalism, Open Democracy and The Bristol Cable – have signed up to independent press regulator Impress.

They join more than 200 other – mostly small, online and either local or specialist – member publications to Impress, which is the Royal Charter-recognised press regulator.

Rival regulator the Independent Press Standards Organisation represents most newspaper and magazine publishers in the UK including all the nationals except for The Guardian, The Observer, Financial Times and The Independent which are not signed up to any regulator.