President Mnangagwa cancels a trip to Davos and returns home to deal with unrest after a brutal crackdown by his security services, condemned by opposition politicians. Demonstrations started after a hike in the price of fuel.

Also in the programme: The Archbishop of Canterbury reveals he prays in tongues each morning, but what exactly does it involve? And the smartphone messaging service, WhatsApp, announces it will limit all its members to forwarding any single message five times, in an attempt to prevent the dissemination of fake news.

(Photo: Protestors cross a main road in Harare, Zimbabwe, after members of the public went onto the streets to protest over the recent fuel increase. Credit: EPA/Aaron Ufumeli)

Martin Fayulu disputes the constitutional court ruling declaring Felix Tshisekedi the presidential election winner, and has called on his supporters to protest. Some African leaders have congratulated Mr Tshisekedi on his victory – but the continent-wide organisation the African Union has yet to back the result and has postponed a delegation’s visit to the country. We’ll hear from the AU, Mr Fayulu himself, and ask what the international community is likely to do now.

Also in the programme: we’ll hear from one of Yemen’s ‘forgotten villages’, which haven’t received any aid since the war began four years ago; and we’ll discuss - should a prominent profile on social media let you jump the queue when applying for asylum?

(Picture: Martin Fayulu, who says he is the DRC's "legitimate" president. Credit: Reuters)

Pawel Adamowicz was fatally stabbed at a charity event last weekend. He’d been the mayor of Gdansk for 20 years. A day of mourning is underway in Poland today as his funeral service takes place in St Mary’s Church. We’ll hear from someone who knew him.

Also in the programme: the DRC’s Constitutional Court is due to rule on a challenge to the official results of the contested presidential election; and can music affect the taste of cheese?

(Picture: Scouts stand guard at the urn with the ashes of the late Gdansk Mayor Pawel Adamowicz. Credit: EPA)

Scientists believe that following a mainly plant-based diet could save lives, feed 10 billion people and help protect the environment. In a new study published by the Lancet medical journal, academics say that reducing our meat and dairy consumption will help prevent further damage to the planet.

Also on the programme a Ghanaian investigative journalist who helped expose corruption in local football has been shot dead. And we find out why Serbs are so keen to welcome President Putin even though the country aspires to join the European Union.

(Image: Fresh produce in a super market. Credit: Getty Images)

Prime Minister Theresa May's plan to leave the European Union has been defeated by 432 votes to 202. Doubt has now been cast on the whole Brexit process. The main opposition Labour party swiftly tabled a no-confidence motion in her government, which will be debated on Wednesday.

Also in the programme: The government in Kenya says security forces have retaken control of a hotel and office complex in the capital, Nairobi, that was stormed by gunmen. Witnesses and officials say several people were killed and many injured.

(Photo: Theresa May; Credit: EPA)

Turkey has reacted angrily after President Trump threatened to "devastate" its economy if it attacks Kurdish forces after the US withdrawal from Syria. We look at how capable the US is of doing so.

Also in the programme; why millions of fish have died in Australia - and what Nobel Peace Prize winner Malala Yousafzai does for fun.

(Photo: US President Donald Trump (L) and Turkey's President Recep Tayyip Erdogan (R) speak as they attend the NATO summit. Credit: Getty Images)