Add a generous knob of butter and a little olive oil to a large pan and gently sauté the onions until soft, then add the leeks, cauliflower and celery. Place a lid on top and sweat until all the veg is soft.
Add the sweetcorn, stock and milk to the vegetables and let them simmer for 10-15 minutes.
Using a spoon take out one third , blend with a hand-whizzer and return to pan before adding flaked fish. Stir with a little more olive oil and let it cool slightly before serving.
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