Brush a loaf tin with 25g of butter and sprinkle flour around the tin to coat the butter. Preheat the oven to 200°C.
Make sure the bread ingredients are at room temperature – this will help the bicarb to raise the dough as it bakes. Alternatively, warm the milk to blood temperature before adding to the mix.
In a bowl, mix the flour, bicarbonate of soda, salt and sugar.
Rub the remaining 25g of butter into the flour until the mix resembles breadcrumbs – this should take approximately 4-5 minutes.
Add the buttermilk and milk and mix until it has just come together – be careful not to over mix.
Tip and scrape the dough into the prepared tin, cover loosely with foil and bake for 20 minutes. Remove the foil and continue baking for a further 20-25 minutes, or until done. The cooked loaf should produce a hollow sound when tapped on the base.
Notes
The dough can also be baked in muffin tins for individual soda loaves by reducing the overall baking time to around 20–25 minutes.