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Adjust the oven rack to the middle position and pre-heat the oven to 180ºC/fan 160ºC/gas 4.
Grease two 20cm/8-inch round cake tins with butter and line their bases with rounds of baking paper.
In a large bowl, cream* together the butter, icing sugar and vanilla until pale and fluffy. * use either a hand mixer fitted with the double beaters or a stand mixer fitted with the paddle attachment
Transfer the buttercream into a piping bag fitted with a large round nozzle (you can also just use a piping bag with its end snipped off).
Place one of the sponges on your cake stand or platter of choice.
Spread the jam in an even layer on top of the sponge.