Heat the oil in a large frying pan and cook the onion and celery until soft but not coloured, about 10 mins. Throw in the garlic and cook for 1 min more. Pour in the wine and simmer on a high heat until most has disappeared.
Pour in the stock and cornflour mix and simmer for 5-10 mins, stirring often until thickened. Season, then add the seafood and most of the dill. Simmer for a few mins until piping hot, then stir in the crème fraîche.
Meanwhile, cook the garlic bread following pack instructions. Divide the stew into warm bowls and scatter with the remaining dill. Serve with garlic bread for dipping into the stew.
