British Horse Society Equestrian Incidents Mapped
The British Horse Society Equestrian Incidents has updated it main website and now includes an Equestrian Incidents Map.
The map details incidents based on these categories which can be filtered
Bird Scarer or Gas Gun
Low Flying Aircraft
But when zoomed in close enough users can switch to the OS 1:25k (most detailed) maps
Incident map - http://www.horseaccidents.org.uk/sitecore/content/mss_content/Websites/Incident/View_Incident_Locations.aspx
If you want more then the Equine Mapping and Geographical Information Network is a good resource using the mapping engine as the incidents map.
This map is available at - http://www.emagin.org/