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Add the spaghetti to a large pan of boiling water. Bring back to the oil and simmer fast for 10-12 minutes or until just tender.
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Heat the oil in a large pan and cook the walnuts for 1 minute until crisp. Remove the nuts with a slotted spoon and set aside.
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Add the leeks and butter to the pan and cook over a medium heat, stirring often, for about 8 minutes, or until the leeks are soft.
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Add the spinach and sultanas and stir until the spinach wilts. Season.
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Drain the pasta and return to the pan. Add the spinach mixture and walnuts, then toss together.
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Divide the pasta between 4 bowls. Serve sprinkled with the cheese and seasoned with black pepper.