Trading Standards says many are entering the UK with noncompliant plugs, meaning they're more likely to overheat, explode or catch fire. In October, the London Fire Brigade was called to two fires in two weeks -- one of which required four engines and 20 firefighters to extinguish.

Leon Livermore, CEO for the Chartered Trading Standards Institute says:

"Criminals and irresponsible manufacturers will often exploit high demand and attempt to flood the market with cheap and dangerous products. Consumers should not let a new fashion or craze cloud their judgement and remain vigilant at all times, to avoid taking home an unsafe product."

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