A judge, who sentenced a triple killer to a minimum of 40 years in prison, was barred from giving a whole life term because of a European judgment that those sentences are in breach of human rights.
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Ukip leader Paul Nuttall also said he would want to get rid of Sharia courts.
Over 40,000 people picked up their packs to take part in the annual marathon in the capital.
The country's voters are concerned about security, the economy, and the 10% unemployment rate.