Housing benefit will no longer cover the housing costs of private renting, workless families with 3 or more children anywhere in London.
For low-income single adults without children, a third of London's boroughs (34%) are unaffordable under the welfare reforms.
Demand for the cheapest properties means that even 13 of London's 19 outer boroughs are unaffordable for families reliant on housing benefit.
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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