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Style Assist is mainly for articles written by journalists that are employed by third-party news organisations (who own the UK's local news outlets) but are subsidised by the BBC - these people are "local democracy reporters".

LDRS articles are made free to everyone in the scheme (including the BBC), but because the content is written primarily for their home news org the articles that end up being published by the BBC need to be modified to comply with the BBC's editorial guidelines and for style reasons.

Hence, Style Assist.

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I see. Journalism is much more nuanced than I had imagined. The article I linked mentions there are 1,200 rules in the BBC News style guide!
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And I'll add that whether the style guide or the journalists, BBC articles tend to be like this: constantly saying sentences without giving the full context needed to understand them. This is why as a right wing person I tend to read The Guardian (famously left wing) instead of the BBC, because their articles just read better.
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