This paper focuses on the vocabulary differences between British Mandarin Chinese and Putonghua. Drawing on a newspaper corpus, I demonstrate a number of results: there are lots of new words in British Mandarin Chinese; those words which are shared by British Mandarin Chinese and Putonghua are different in their sememes and connotations; differences are also found in the collocation of words; due to the historical connection between the United Kingdom and Hong Kong, many Cantonese words have become part of the British Mandarin Chinese. Meanwhile, I analyze the main causes of these differences and propose communication strategies between speakers of British Mandarin Chinese and speakers of Putonghua.