The women returned home last month, and claim they're still having to take antidepressants to cope.
Consular staff, both in London and China, assisted the detainees and their families in the UK, to the best of their abilities.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants