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Something like http://www.ebay.co.uk/itm/Mini-12V-24V-DC-Port-USB-2-Output-Car-Charger-Adapter-iPod-iPhone-3G-S-4G-4S-/120815127653?pt=UK_MobilePhones_MobilePhoneAccessories_MobilePhoneChargers&hash=item1c21248c65 costs only £1.45 ...
If you take the little circuit board out, hard wire one side to your 12v supply, snip the PC-end socket off a USB lead and solder the wires to the 5v output, porbably want to put it inside a little case from Maplins or similar for neatness - job done.
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