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You walk into the pub, walk confidently up to the bar, greet the landlord with, "good day my fine fellow I shall have a pint of your finest ales & drinks all around for your customers, before you pour the beers could you just direct me to a vacant socket so I can charge up my poser machine, Thank you".
Though, I wouldn't try it in the railway, you may get killed by the stampede of accywebbers fighting their way to the bar for the free drinks.