Preheat the oven to 160c and grease or line a loaf shaped cake tin
Beat the butter with a stand mixer or electric hand mixer until soft and smooth before adding in the sugar and beating for a further five minutes until light and fluffy
Use a spatula to scrape down the sides of the bowl
Beat in the eggs one at a time adding in a tablespoon of flour after each egg to prevent curdling
Add in one third of the flour followed by a tablespoon of the warm milk and gently mix until combined
Repeat this process until all the flour has been incorporated
Add in the lemon zest and a pinch of salt and stir to combine before pouring into the prepared loaf tin
Smooth the top of the batter then place into the preheated oven for one hour until a toothpick comes out clean when inserted into the centre of the cake
Once removed from the oven leave to cool for ten minutes in the tin before turning onto a cooling rack to cool completely