Heat the oven 350f, 180c or gas mark 4. Grease a loaf-pan.
In a bowl mix together the flour, baking powder and salt. set aside.
In another bowl beat the eggs until doubled in size.
Add the sugar, zest and the oil beat until it creamy.
Add the flour and mix until incorporated don't over mix.
Put the mixture in to the greased baking pan.
Bake for 40 minutes or until a tester comes out clean.
To make the orange glaze
Mix all the ingredients and drizzle over the top of the warm cake.