Lightly grease, and line with parchment, a deep 23cm round cake pan. Preheat the oven to 180°C / 160°C fan.
Place the butter, sugar and zest into a large bowl and using an electric mixer beat together until light and fluffy, about 5 minutes. Add the eggs a little at a time, beating in until fully combined before adding more. Mix in the cooled white chocolate until evenly combined. In another bowl mix together the flour, almonds, baking powder and salt. Starting and finishing with the flour mixture, add in three additions, alternating with the cream.
Scrape the finished batter into the prepared cake pan and gently smooth into an even layer. Bake in the preheated oven for about 45-50 minutes or until golden brown and a skewer inserted into the middle of the cake comes out clean. Pop the pan on a wire rack and allow the cake to cool for 10 minutes before turning out onto the rack to cool completely.
Whilst the cake is still warm make a syrup by heating the blood orange juice and sugar together in a small pan until the sugar has dissolved and the mixture just comes to a simmer. Brush the syrup all over the cake, doing so whilst the cake is still warm allows it to full soak into the cake. Once the cake is fully cooled make the glaze. In one bowl mix together the blood orange juice and half the sugar mixing to form a thick but just pourable glaze. Do the same with the milk, vanilla and remaining sugar. You want the glazes to be thick enough that they will hold some definition when piped but loose enough that will spread together to form a uniform glaze.
Place each glaze into a piping bag and snip off the ends with a pair of scissors. Pipe alternate stripes of the glaze over the cake, allowing a little excess to drip down the sides. Set the cake aside for a couple hours to allow the glaze to set before serving.
