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Phew, thank you!
Don't know what I - or many here on AB - would do without you, Chris. The converter came with absolutely no instructions, and I thought the other cable it came with was to connect it to some other sort of device. I understand completely now, just have to get hold of the mains/USB thing - annoying as could have added it to my order, now I'll have to fork out again for postage :(
Many thanks again. Off to bed, goodnight.