Sky news obviously do not proof read their main headlines on their website or the editor of the below line clearly doesn’t know their grammar.

big-mistake

One should only use an in place of a when it precedes a vowel. There are obvious exceptions to the rule namely; Use an in place of a when it precedes a vowel sound, not just a vowel. That means it’s “an honor” (the h is silent), but “a UFO” (because it’s pronounced yoo eff oh).

The actual mistake with the above sentence is a missing word (injured). It should have read: “A British yachtswoman says the “spirit of ocean racing” led to her briefly scrapping a round-the-world race to help rescue an injured rival”.
sam-davies

At last something the British are good at.