Video-sharing app TikTok has denied that it is controlled by the Chinese government. The BBC's Sophia Smith Galer explains the attraction of the service for its users. We address rumours that talks between TikTok parent ByteDance and the UK government over a new headquarters for the firm in London have been called off, with Theo Bertram, TikTok's public policy director for Europe, the Middle East and Africa. And Emily Taylor, associate fellow with the International Security Programme at Chatham House tells us why countries like India and the US are not reassured by TikTok's guarantees about the safety of users' data. Also in the programme, the United Nations is making an urgent appeal for funds to avert famine in Sudan. We hear why from Gwi-Yeop Son, the UN's humanitarian co-ordinator for the country. Plus our regular workplace commentator, Pilita Clarke, considers whether coronavirus marks the end of the era of hot-desking in the modern office.