Grease a 2lb loaf tin (900g) with greaseproof/parchment paper. Preheat the oven to about 170C or 160C fan.
Place your black treacle, golden syrup, dark brown soft sugar and dairy free spread into a saucepan with 70ml of water. Gently heat and stir until completely melted. (Don't allow it to boil!)
Sift your flour and spices into a mixing bowl and then add your warm syrup/treacle mixture to it. Beat together using a wooden spoon until lovely and smooth.
Add half your beaten egg and mix thoroughly, then repeat with the other half.
In a small dish, add 2 tbsp of water to the bicarbonate of soda, mix until well combined and then add to your main bowl too. Mix once more. Your final mixture should now look nice and smooth, with a runny consistency.
Pour your mixture into the loaf tin and bake for 60 minutes.
Once baked allow to cool. The cake should be almost firm to touch, but will firm up more as it cools.