If we merge bbc.com and bbc.co.uk, we end up with 125 / 10,000. I suppose that isn't that many compared to others, but it's still higher than I think it should be. ArsTechnica (which often runs the same articles, such as this SpaceX one) only has 68 / 10,000 and the articles are written with a lot more technical detail.
Nevertheless, I'm not really sure what can be done about it. We can't ban the BBC from HN, as with BuzzFeed, because that's over the top - there's some good content. A nice solution might be to remind people, on the submission page, that it's better to go to the source - or at least a good, technical write-up - rather than a news post that is written for the general public.