Good news.
I am pretty sure my sony reader prs-500 came with American charger(although it works with 220V too!) and plug.
I have a converter/or can buy one easily UK to USA plug for my canon charger. Although I am not sure it is suitable for 110V. Although it is possible it has the same property as Sony Reader's charger, which makes them suitable for both 110V and 220V at the same time. I will have a look at mine tonight or tomorrow and post here what is written on the back of the Canon charger.
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