Place the flour, baking powder, baking soda and salt in a mixing bowl and whisk until all the ingredients are combined.
Beat the butter, sugar and lemon zest until light and fluffy.
Add the eggs to the butter mixture one at a time. Making sure to scrape down the side of the bowl every now and then.
In a separate bowl, combine the buttermilk, lemon juice and vanilla essence.
While the mixer is running on medium speed add the flour mixture to the butter, alternating with the lemon juice mixture.
Mix until just combined, do not overmix the batter.
Pour the batter into the prepared bundt cake tin and pop it into the oven.
Bake for 45-50 minutes or until a fork inserted comes out clean.
Allow cake to cool completely before removing the cake from the tin.