Spicy Cheese, Sweetcorn and Potato Soup

In large saucepan, melt margarine over medium high heat. Add celery and onion; cook and stir until tender, about 5 minutes.

Add chicken stock; bring to the boil. Add potatoes; cook over low heat for 20 to 25 minutes or until potatoes are soft, stirring occasionally.

Stir in sweetcorn and chillies; return to the boil. Dissolve white sauce mix in milk; stir into boiling mixture. Add cheese and chillies (if using); cook and stir over low heat until cheese is melted.