London Cycling Campaign is warning internet sites which don't require identification are becoming popular for thieves selling on bikes. Often, a thief won't post a real photo of the bike, and will expect a quick sale, often conducted by mobile phone and on a street corner or outside a pub.
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The service was due to start in September but there is no agreement on pay and conditions such as how many night shifts staff will work.
Would you know what to do if you needed help? Here's the official advice from the Foreign Office.