Put the eggs and buttermilk in a bowl and whisk together until well combined. Set aside until needed.
Sift the plain flour, potato flour, baking powder, bicarbonate of soda, cocoa powder and salt into the bowl of an electric mixer fitted with a paddle attachment. Add the sugar and butter and mix on low speed for about 1 minute, or until the butter is incorporated. Increase the speed to medium and add the buttermilk mixture in three batches, mixing for about 30 seconds between each batch and scraping down the sides after each addition. Divide evenly between the two cake tins and
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