Benefits cheats should be shamed by having their photo pinned to every lamppost in their street, an official at the Department for Work and Pensions said.
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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.