The breed originated in 1928, when the owner of the island, Martin Coles Harman, introduced 34 New Forest pony mares, eight foals, and a Welsh Mountain B strawberry roan stallion.
Racen opstod i 1928, da ejeren af ​​øen, Martin Coles Harman, indførte 34 New Forest-Ponyhopper, otte føl og en Welsh Mountainhingst.