Place the raisins and rum in a small saucepan, bring to the boil then remove from the heat, cover and leave to soak for 1 hour. Meanwhile, preheat the oven to 180°C/160°C fan/350°F/gas mark 4. Grease a 2lb loaf tin (approx 11.5 x 21.5 cm / 4.5 x 8.5 in) and line it with baking parchment.
150 g (1 cup) raisin or sultanas, 100 g (7 Tablespoons) dark rum
Drain the raisins really well in a fine mesh sieve, reserving the liquid.
Mash the banana really well in a large bowl. Whisk in the sugar, oil, milk, vinegar and vanilla extract. Measure out 3 Tablespoons of the reserved raisin rum and whisk that into the banana mixture (top it up with more rum if there isn't quite enough).
330 g (peeled weight) very ripe banana, 175 g (1 cup) light brown soft sugar, 110 g (½ cup) neutral oil (I use olive), 45 g (3 Tablespoons) unsweetened non-dairy milk (I use soy), ½ teaspoon cider or white wine vinegar, 1 teaspoon vanilla extract
Whisk in the baking powder, bicarbonate of soda, cinnamon, nutmeg and salt.
1 teaspoon baking powder, ½ teaspoon bicarbonate of soda (baking soda), 1 ½ teaspoons ground cinnamon, ¼ teaspoon ground nutmeg, ¼ teaspoon table salt
Add the flour and stir with a balloon whisk until no dry lumps remain but be careful not to over-beat the batter. Fold in the drained raisins.
265 g (2 cups + 2 Tablespoons) plain (all-purpose) flour
Pour the batter into the prepared tin and spread it level. Bake for about 70 minutes until firm and springy to the touch and a skewer inserted into the centre comes out clean.
Leave to cool in the tin for 20 minutes then carefully turn out onto a wire rack and leave to cool completely. Once cold, store in an airtight container for up to five days.