Preheat oven to 375 F (190 C).
In a large bowl, whisk together flours, oats, baking soda and salt. Using a pastry blender, cut butter into the flour, until mixture resembles coarse crumbs.
In a separate bowl, stir together honey, egg and buttermilk (the honey may not thoroughly dissolve, that is ok). Add mixture to dry ingredients, and toss with a fork until a shaggy dough forms.
Turn dough onto a floured work surface and gently knead a few times until it comes together in a ball. Place on baking sheet, and bake 30-35 minutes, until top springs back when gently pressed in the centre.