Answer
Laura Muir broke the British record in the 5000 metres indoor event in 2017. She set a time of 14:56.30 at the Millrose Games in New York City on 12 February 2017. This record was previously held by Jo Pavey, who set a time of 14:57.74 in 2005. Muir's time was the fastest time ever run by a British woman in the indoor 5000 metres event.