It's a fairly common Britishism that, now you mention it, I have absolutely no clue about the etymology of! I'm going to have to go look it up!
[Comes back from looking it up... apparently it dates back to the 14th century or so, in fact, so it's a very OLD Britishism! :) --- http://www.worldwidewords.org/qa/qa-cha4.htm ]
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Date: 2015-03-04 01:00 pm (UTC)[Comes back from looking it up... apparently it dates back to the 14th century or so, in fact, so it's a very OLD Britishism! :) --- http://www.worldwidewords.org/qa/qa-cha4.htm ]