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@moth
I think you just need to feed 5V dc into the right pins of a micro USB connector. If you were going back further i'd suggest either learning to build a suitable battery of primary cells, e.g. http://en.wikipedia.org/wiki/Daniell_cell , or taking a solar-panel based charger. But 60s UK had modern electricity and sockets, so just take your normal charger. (Older buildings might still be wired with 15, 5 or 2 amp round pin sockets, but you'll have better luck finding adaptors then than now.)