Just to clarify - we do not allow "in ear" earphones at the Wyvern 10K - because it stops runners being able to hear our marshals and any vehicles that might be on the route. Safety is always the priority.
However we will allow runners to use bone conducting devices provided that they do not cover ear holes in any way. We would stop any runner that we felt still had their ears "impeded" regardless of the type of earphones.
Our blog will keep you up to date with all the developing details of the event