Why do Canadian customers choose British immigrants?

Before Hong Kong's return to China, it was a British colony and Canada was a Commonwealth country. Hong Kong people's English level is very good, and there are few language barriers to immigration to Canada. In addition, it was not difficult to immigrate to Canada at that time, not only Hong Kong people, but also many immigrants from Chinese mainland. After 1997, many Hong Kong people did not adapt to the cold climate in Canada and returned on a large scale.