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Bitcoin is the world's most popular virtual currency and one is now worth up to £14,000.

Bitcoin ATMs have been popping up all around the country where you can buy, and sometimes sell, the currency for cash.

However, there are concerns about them being used by criminals to launder money.

But Larry Koloz from Street News in Central London, says they have a limit of £2,000 a day on their machines, which make them unsuitable for money laundering.