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Preheat the oven to 180C/160C Fan/Gas Grease and line the base and sides of a 900g/2lb loaf tin with baking parchment.
Put the mashed bananas in a large bowl and add the sugar, flour, sultanas, pecan nuts (if using), mixed spice and baking powder.
Mix lightly with a wooden spoon until roughly combined, then add the oil and beat together well.
Spoon the cake batter into the prepared tin and smooth the surface. Bake for 55–60 minutes, or until a skewer inserted into the centre of the cake comes out a little moist, but clean.
Leave the cake to cool in the tin for 10 minutes, then carefully turn out onto a wire rack and leave to cool for around an hour before serving.