Mix the first five (dry) ingredients in a small bowl. and set aside.
In another largish bowl mix all the remaining ingredients (wet ones) in a large bowl until combined so there are no unsightly lumps of marmalade. Sift the dry ingredients into the wet ingredients and lightly stir until just combined. Do not overmix or the loaf will be very heavy. A lumpy batter is just fine.
Scrape the batter into a greased and floured medium sized loaf tin and sprinkle some or all of the 2 tbsp sugar (if using). This sugar gives the top of the loaf an interesting crunch. Bake at 180C (350F) for about 40 minute or until a toothpick in the centre comes out clean.
Cool the loaf in the tin for about 5 minutes, and then loosen it. Remove from the tin and cool completely on a rack. Slice and serve. This loaf serves 6 to 8 people.