The friction caused by the gas bubble pushing up the pipe and displacing the drilling mud used to control the pressure could have created a static charge that ignited the gas into a fireball.

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The system had only a handful of games and was plagued with problems from the start, including a 16x16 pixel LCD screen that was prone to rotting and cartridges that could be permantly damaged by even a relatively small static charge.

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The definition of a "hot" pasty is being altered to allow the reversal, while a 20% charge due to be levied on static caravans will now drop to 5%.

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But one team from the Georgia Institute of Technology have created a new technique that uses bodily movement, such as footfalls, to generate static electricity that can then be harnessed in quantities that could viably charge larger devices.

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