British Foreign Secretary Jeremy Hunt will visit Saudi Arabia on Monday where he will press King Salman and Crown Prince Mohammed bin Salman over the murder of journalist Jamal Khashoggi.
During a trip to the region that includes a visit to the United Arab Emirates, Hunt will also seek to build support for UN efforts to end the conflict in Yemen, the Foreign Office said.
His visit comes amid an international diplomatic crisis over the murder of Saudi journalist Khashoggi, a US resident, at his country's consulate in Istanbul in October.
"The international community remain united in horror and outrage at the brutal murder of Jamal Khashoggi one month ago," said Hunt, who will also meet Saudi Foreign Minister Adel al-Jubeir.
"It is clearly unacceptable that the full circumstances behind his murder still remain unclear.
"We encourage the Saudi authorities to co-operate fully with the Turkish investigation into his death, so that we deliver justice for his family and the watching world."