In a large bowl, combine the flours, baking soda/bicarbonate of soda and salt and whisk/stir to mix
To this mixture, add most of the buttermilk (hold back a little) and honey and any additions, if using. Mix a little with a spatula then mix by hand to bring the dough together. If the dough is flaky, add more buttermilk - it will be a bit sticky. Take care not to overmix - it should come together relatively easily. Don't knead as this can reduce air pockets before they even get a chance to form.
Tip the mixture out on to a lightly floured surface and clean off your hands. Divide the mixture into four then use lightly floured hands to round them off into rolls. Try to smooth off and cracks or joins but otherwise handle lightly.
Place the rolls on a lightly oiled baking sheet/tray with a good 2-3in/5cm or more between them as they will expand. Gently score the top with an "X" and you can optionally brush with a little buttermilk, though they also work fine without.
Bake in the oven for approximately 20 - 30 minutes until gently browned and hollow sounding when you tap the bottom.
Video
Notes
You can add in additions to taste, such as some grated cheddar, nuts/seeds or herbs as savory additions, or raisins or other dried fruit for a slightly sweeter version.