Campaigners have urged David Cameron to raise China's human rights record during his meeting with the country's premier Li Keqiang.
Mr Li is is accompanied by a team of Chinese business bosses, who are in the UK for the return leg of a trade boosting link-up begun by David Cameron last year.
On the eve of Mr Li's visit, Deputy PM Nick Clegg said the government would not shy away from raising China's "large scale and systematic" human rights abuses.
Activists campaigning for a variety of causes including Tibetan independence staged a noisy protest opposite the gates of Downing Street.
More top news
Nigel Farage told ITV Tonight the 45th president will boost Britain as he identified the one thing Trump must do in power to be a success.
Dan Evans has caused another shock at the Australian Open by beating Bernard Tomic to reach the last 16.
Fighters blew up Palmyra's Tetrapylon and the facade of its Roman Theatre, according to Syrian antiquities chief Maamoun Abdulkarim.