A new study by the Trade Unions Congress has found in the capital, 6,500 young people aged between 18 and 24 have been out of work for more than 12 months.
Total youth unemployment has risen by 58% since the year 2000.
We've been speaking to Londoners Alex Kouam, Sophia Kichou and Claudette Shay from Centrepoint Parliament, who have struggled to find work.
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A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
Officers were given the touching letter at Brixton Station while they were on a reassurance patrol after yesterday's attack
The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.