Preheat oven to 350°F Grease and flour a 9-inch bundt pan.
In a large bowl, sift together flour and cocoa powder. Whisk in sugar, brown sugar, baking soda and salt. Pour in water, vegetable oil, vanilla extract and vinegar, whisking thoroughly, but quickly, until the batter comes together and is quite smooth.
Pour into prepared pan.
Bake for 45-50 minutes at 350F (my oven was a little wonky, so do check with a toothpick), until a tester comes out clean and the cake springs back when gently pressed.
Allow to cool in pan for 10 minutes, then turn out onto a wire rack to cool completely. Once the cake as cooled, top with any glaze.