Theresa May has promised to deliver a “robust” message to Saudi Crown Prince Mohammed bin Salman about the murder of journalist Jamal Khashoggi when she meets him at the G20 summit.

The face-to-face meeting in Argentina today is likely to prove the most difficult encounter of the two-day summit of major economies for the Prime Minister, who will also raise the issue of the war in Yemen

The UK has issued demands for a transparent and credible investigation into the death last month of Khashoggi in the Saudi consulate in Istanbul.