Thanks to everyone else for your comments, regardless of whether they were in agreement with me or not. I'll bring my headphones as back-up but see how it goes without them on the day.
Was looking forward to entering this but it's yet another race that doesn't allow headphones, despite being largely park-based. Is this really the way races are going? I've heard the arguments about not being able to hear the marshals but I've never once not been able to hear what a marshal said and that's what the pause/volume button is for...
If the organisers are really concerned, can't there be a disclaimer or something to sign?
I imagine lots of people may respond and eschew the virtues of running headphone-free but for this sort of distance, it's just not an option for me and many runners that I know. I can't be the only one?
I see fancy dress is permitted - perhaps I'll run as a DJ...