I want to know the answer to the following question:
When did Britain encourage immigration of workers?
All the background I'm provided with is that "The preferred official umbrella term is "black and minority ethnic" (BME), but sometimes the term "black" is used on its own, to express unified opposition to racism, as in the Southall Black Sisters, which started with a mainly British Asian constituency, and the National Black Police Association, which has a membership of "African, African-Caribbean and Asian origin".". Is that enough to answer the question?
Answer: no