The Scottish swimmer finished in fourth place at Tollcross this evening with a time of 2:25.40 minutes.
"[It's] a massive PB," Miley told reporters. "I've never been under a 2:28 before, so to go 2:25.04 - I'm just stunned by that. A lot of people are like, 'are you gutted about missing out on a bronze?' but the PB is fine! I'm really, really happy with that. I'm slightly lost for words, for once!"
Miley won gold in the 400m individual medley earlier this week.