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You'd have a point if the BBC hadn't capitalized the Who, but they did, so your pedantry is not only needless, but wrong.

Would you expect them to throw quotation marks around Anton Whom in a headline including his name?

Italicizing it or quoting it would have worked. As it is, it's just incoherent, and you're working too hard to apologize for incompetence.

Can you explain? It seems like a pretty standard British news/newspaper headline to me.

You may not understand it, but it is grammatically correct.

Only because you read it as Doctor Who (the noun, which should have included quotes or underline or italics).

You always write for an audience. BBC viewers can probably be assumed to know about Doctor Who.

Capitalizing it is sufficient in this context.