preheat oven to 350 f/180C /gas 4 . Line the cake tin with baking paper (about 9 inch) and grease
for the.topping mix all topping ingredients in a bowl, rub between your fingers until it resembles fine breadcrumbs.
cream all cake ingredients together in a blender .
Pour half the batter into cake tin ,cover with half the topping mixture.
cover crumble mixture with rest of batter then cover with rest of crumble mix .
Bake until browned 60-70 minutes. Let stand for 5 minutes turn onto cooling rack .