/ Gas Mark 3. Grease an 8-inch (20 cm) springform cake tin, or line a suitably sized tin (I used a large loaf tin).
Cream butter and sugar together until pale and fluffy, ideally with a stand mixer or electric hand mixer, or you can do this by hand with a wooden spoon.
Beat in eggs one at a time, then mix in milk and sifted flour.
Fold in about ¾ of the apple slices along with the currants/raisins and Roquefort.
Spoon the batter into the prepared tin. Arrange the remaining apple slices on top. Sprinkle Demerara sugar over the surface.
Bake for ~55 minutes, until risen and golden. Allow to cool in the tin.