Your Welfare Queen example is more appropriate than I think you intended. The term was popularized by Ronald Reagan as a way to get elected. The message was clear-- black people are taking money from hard earning white tax payers.
This is the reason that an article about a single mom getting a nice apartment is posted with "immigrants" in the title even though the article to indicate that she is not a citizen.
Immigrant here doesn't mean immigrant-- it means dark skinned person. And the narrative here is the same that we see in the US.
Her contributions to Britain-nothing.
This statement, made with no knowledge of this woman's life, or work or family or social involvement... based on on nothing but the color of her skin, is the saddest example of racism I have seen in a long time.