Brentwood Half marathon disqualifies people who wear them.
They put up plenty of info on their website, and signs up around the race HQ, yet people STILL turn out wearing them. I think most races do publicise it if they are banning MP3s. More and more are doing so.
That misinformation about all UKA races was not RW's fault, it was reported as being a fact by someone who you'd think would know.
However, if a race DOES choose to ban the use of MP3s, that's up to them and people should respect it.
Seriously, you can run without. Thousands of people manage.
Edited: 03/01/2013 at 16:53