200g/7oz plain flour
2 tsp baking powder
1 tsp bicarbonate of soda
200g/7oz soft dark brown sugar
130g/4陆oz light soft brown sugar
100g/3陆oz dark soft brown sugar
75驳/2陆辞锄 caster sugar
200g/7oz dates, pitted
陆 tsp vanilla extract
2 tsp vanilla extract
100g/3陆oz unsalted butter, plus extra for greasing
120g/4oz unsalted butter
500ml/18fl oz double cream
200ml/7fl oz double cream
3 free-range eggs
4 free-range egg yolks
50ml/2fl oz whole milk