Sticky toffee pudding with butterscotch sauce and vanilla ice cream

Cooking ingredients

1 tbsp bicarbonate of soda

150g/5½oz soft dark brown sugar

100g/3½oz soft brown sugar

175g/6oz pitted dried dates

175g/6oz self-raising flour, plus extra for dusting

80g/3oz sugar

2 tbsp black treacle

½ tsp vanilla extract

½ vanilla pod, seeds only