Melt the butter in a large saucepan and add the mixed vegetables, stock and milk, bring to the boil. Add the potatoes and simmer for 10 minutes.
Add the sweetcorn and haddock and cook for a further 5 minutes, season to taste. Ladle into 4 bowls and top with cheese.
375g Smooth potatoes, such as Desiree, cut into 2cm pieces
500g frozen mixed vegetables
175ml chicken stock
300ml semi skimmed milk
198g tin sweetcorn, drained
375g smoked haddock cut into 2.5cm pieces