Metropolitan Police Commissioner Bernard Hogan-Howe says the people of London should always expect "high things" of the Met. He said that "where necessary we (should) get rid of the people who are damaging our reputation".
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The London Mayor has made some forthright comments about Britons who have been lured to join Islamic State.
Bright spells with rain, sleet and snow showers at the weekend.
As soon as the information went missing in early January, the Ministry of Justice say they launched an urgent investigation.