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Cream the margarine and sugar.Beat in the eggs one at a time.
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Sift the two flours and mix with the sultanas.(This will prevent the sultanas from sinking to the bottom of the cake mix).
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Add to the mixture and stir until smooth.
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Grease a 6 inch square cake tin and line with greaseproof paper.Grease this and coat with plain flour.
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Pour in the cake mixture and spread evenly.
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Line the outside of the tin with brown paper and tie with string.Put a brown paper lid on top(with holes cut in to allow steam to escape).This will prevent the cake from burning.
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Bake in a pre-heated oven,325deg F.,for 2.5 - 3 hours,until a skewer comes out clean.An experienced cook can listen to the cake and it will tell you when it is done(no gurgling sound).
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Once cooked,leave in the tin for 5 minutes before cooling on a wire rack.
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Cut into slices and serve.