Preheat the oven to 180 degrees for 10 minutes
Line the loaf tin and dust with a bit of flour.
Into the mixing bowl add the wet ingredients and whisk well together till smooth.
Sift in the dry ingredients.
Mix well but dont whisk it a lot.
Divide the mix into two halves.
To one half add the cocoa powder and mix well.
Pour half of the plain mix into the prepared loaf tin.
Form a line with the cocoa batter.
Alternate with the two batters till they are finished.
Now, using a skewer, gently doodle the tor batter together to crate the marbling effect.
Bake at 180 degrees for 15 minutes or till the skewer comes out clean.
Remove and place on the cooling rack for about 10 minutes.
Once cooled the loaf is ready to be enjoyed.