BEIJING (Reuters) – China said its security agencies found another incident of spying in which the British Secret Intelligence Service, also known as MI6, used a foreigner in China to collect secrets and information. The case by China highlights the ongoing heated exchanges the countries have traded over accusations of perceived spying that threatens their respective national securities. China’s Ministry of State Security revealed on its WeChat social media account on Monday that a foreigner, only identified by surname Huang, was in charge of an overseas consulting agency, and in 2015, MI6 est…