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Heat oven to 160C/140C fan/gas 3. Grease and line 3 x 20cm cake tins with baking parchment. Tip all the cake ingredients into a large bowl and beat with an electric whisk until smooth. Divide between tins and bake for 25 mins until a skewer poked in comes out clean. Turn out onto wire racks to cool.
Split each cake in half. Mash the jam and raspberries together, then spread over 5 cake halves, leaving 1 top half free. Sandwich together, with the plain cake on top. Put on a plate and cling film thoroughly. Invert a cake tin on top like a hat and top with 3 x 400g food cans. Leave overnight.
To finish, beat the butter, cheese and icing sugar together, then spread over the cake. Decorate with extra raspberries and a dusting of icing sugar, if you like.