Banana Bread

This is one of the most tasty banana bread recipes I've tried. It's a Nigella Lawson recipe, and I have to say it's a keeper!
2/3 C golden raisins
5 Tbsp Gosling's dark rum
1 1/4 C flour
2 tsp baking powder
1/2 tsp baking soda
1/2 tsp salt
9 Tbsp unsalted butter, melted
3/4 C light brown sugar
2 eggs, well-beaten
4 ripe bananas, mashed
1/3 C walnuts, chopped
2 tsp vanilla extract

Preheat the oven to 325 degrees.
Cover the raisins with the rum and microwave for about a minute. Cover with plastic wrap and set aside for about 15 minutes, before draining.
Sift the flour, baking powder, baking soda, and salt into a mixing bowl and stir.
In another large bowl, mix together the melted butter and brown sugar until the mixture begins to froth and bubble up.  
Add the beaten eggs and the mashed bananas. Mix together, then add the walnuts, drained raisins and vanilla. Add the dry ingredients in batches and stirring well each time.
Line a loaf tin with wax paper or lightly buttered foil, and then pour in the mixture.
Bake for about 1 1/4 hours until done. Allow to cool before slicing.