@Economister: In most of the world's English-speaking countries, the use of the plural is correct. Collective nouns take plural verbs in the Commonwealth countries, for example. I'm not sure where, outside America, the singular is required.
An internationally-published author (especially one with a name like Adrian Kingsley-Hughes) might well be other than American. We don't write the world's rules for the English language, fortunately.
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