What the Heck Is grain free pony feed UK?

https://daily-horse-feed417.huicopper.com/horse-feed-for-horses-requiring-condition-what-to-choose-and-why

Gentle horse feed for sensitive stomachs, designed to support gut comfort, hindgut health and efficient nutrient uptake. A low-starch fiber-rich formula with natural components to help maintain calm digestion and overall wellbeing.