By way of completion, and in case anyone is searching 12V sockets in the future, I have just installed this from Amazon, as nowhere local seemed to sell one which had a USB socket. It seems to work fine so far (30mins and counting!), has a USB socket, an inline fuse, and a cool blue light https://www.amazon.co.uk/gp/product/B017BJUCVE/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 Jon