Preheat your oven to 160°C fan (350°F). Lightly butter your bundt tin (I use a 20cm/8-inch silicone bundt tin).
Cream together the butter and sugar with a handheld mixer until light and fluffy. Beat in the eggs, one by one, until well combined.
Sift in the flour and baking powder, and stir together carefully on a low speed until just combined.
Add the honey and lemon zest, mix well.
Place the batter into the prepared tin and bake for 40 to 45 minutes or until a skewer inserted into the cake comes out clean. Put bundt on sheet pan for better support
Allow to cool in the tin for 5 minutes, then carefully release the cake onto a wire rack. Leave to cool completely.
To make the icing, sieve the icing sugar into a bowl and begin to mix in the lemon juice and whisky to make a thick but pourable icing. If it isn’t runny enough to pour on, mix it in a teaspoon of water.
Pour the icing over the cake, scatter over the lemon zest and serve—an accompanying mug of hot toddy is optional!