Final answer:
The question about what happened at the Chinese embassy in London is not specific to a particular event; however, historical events such as protests following the Tiananmen Square Massacre or tensions during the First Opium War provide context for potential incidents at Chinese embassies abroad.
Step-by-step explanation:
The question does not specify exactly which incident at the Chinese embassy in London is being referred to, since numerous incidents could fall under that description, such as protests or diplomatic events. However, historical context about China's international relations and domestic issues can provide insight into various incidents involving Chinese embassies abroad. For instance, the Chinese government's actions during events such as the Tiananmen Square Massacre and their treatment of Tibetans have often sparked protests outside Chinese embassies around the world, including London. Additionally, the Boxer Rebellion saw foreign embassies in Beijing under siege, illustrating historical tensions involving embassies on Chinese soil. Similarly, diplomatic frustrations were evident during George Macartney's mission and the First Opium War, which altered the dynamics between China and foreign powers. These historical events highlight the complex interaction between China and the international community, which sometimes manifests in protests or other incidents at Chinese embassies, including possibly in London.