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@Cranky
I presume you could just use one of these and an appropriate mains to USB plug.
http://www.amazon.co.uk/gp/aw/d/B00DY1KU3O/ref=mp_s_a_1_3?qid=1417201027&sr=8-3&pi=AC_SX200_QL40
Depending on the lights plug you may need a different size of female end.