Melt butter in saucepan over medium heat. Add onions and leeks, sauté gently until soft. Stir in flour and cook for 2 minutes. Gradually stir in stock.
Add potatoes, bring to the boil, simmer gently for 30-40 minutes or until potatoes are soft. Stir in milk and seasonings.
Puree soup in a blender. Add salt and pepper to taste.
Serves 6.
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