Preheat the oven to fan 160°C/180°C. Lightly grease a deep baking trayand line the base with baking paper or alternatively use a non-stick bakingtray. 10" x 8" size tin
Cream together the butter and caster sugar until smooth, pale, light, and fluffy. Preferably with a free-standing mixer or electric hand whisk.
Progressively pour in the beaten eggs, combining well until fully incorporated after each addition. Gradually add the sifted flour and mix to combine well. Add the lemon curd and vanilla extract then mix until the batter is smooth, but do not over mix.
Gently Spoon the mixture into the prepared baking tray, spread into the corners and smooth the surface with a palette knife. Bake on the middle shelf of the preheated oven for 20 minutes or until golden and well risen and a skewer/cocktail stick inserted into the centre of the cake comes out clean.
Pierce the cake evenly with a table fork and allow the cake to cool in the baking tray. Mix the lemon juice with the caster sugar and gradually with a teaspoon drizzle the syrup over the top of the warm cake. Continue to allow the cake to cool in the baking tray. Once cooled remove baking paper and transfer and place on serving plate.
To create the topping, in a bowl mix the cream cheese combined with the lemon curd until smooth, do not over mix. make certain the cake is completely cool before icing. Roughly spread the cream cheese mixture on top of the cake with a palette knife. Garnish and decorate as you wish, just before serving.