food colouring paste, in pink, purple, yellow, green, orange and blue
500g/1lb 2oz caster sugar
1kg/2lb 4oz icing sugar
500g/1lb 2oz self-raising flour, plus extra for dusting the tins
3 tbsp vanilla extract
500g/1lb 2oz salted butter, at room temperature, plus extra for greasing the tins
500g/1lb 2oz salted butter, at room temperature
10 large free-range eggs, lightly beaten
2 splashes milk