1. I didn't have self raising flour with me so I just used 225 grams plain flour (maida) + 2 teaspoons baking powder and 1/4 teaspoon of salt. Over and above this you also need to add the baking soda as mentioned in the recipe above
2. I used 2 teaspoons of ginger powder very hesitantly as I didn't want it to overpowder the cake but I was surprised how subtle it actually was. I suggest you stick to 2 teaspoons if you are using a new pack of ginger powder (freshly manufactured or homemade).
3. If you don't like cinnamon you can leave it out. Adding too much of it will mask the flavour and aroma of ginger and your cake will smell more like cinnamon cake.
4. If you don't have golden syrup you can substitute it with equal parts of light corn syrup and molasses. There are many substitutes for golden syrup available on the internet. Some call for a combinations of sugar caramel (homemade) and cornsyrup or honey or maple syrup