We take a more flexible approach in British English and both ways (plural and singular) are seen as acceptable. It depends on how we are thinking of the 'group'. We say 'the group is' when we are thinking of it as one collective thing but 'the group are' when we are thinking the members of the group are....
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AnonymousIt's odd that you, as an American, ...FYI. You are adding to a thread that has been inactive for more than seven years.