Nook didn't help by having a picture of the US-only connector on the webpage. In the last couple of hours they have changed it and I can confirm you get a 13 amp plug with it.
http://uk.nook.com/accessories/unive.../9780594515364
I bought two of them when they dropped to £10 but it is still too much to pay when you only want the cable. When the price dropped I did wonder if they were starting a clearout. That would be bad for a lot of people in the future. Cables don't last forever.