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Heat the oil and butter in a large saucepan. Add the onion, leek, celery, carrot, potato and a good pinch of salt, and stir until everything is well coated. Cover and sweat gently for 15-20 mins, stirring every so often to make sure that the vegetables don’t catch on the bottom of the pan.
Pour in the stock and simmer for 10 mins. Add the nettles in several batches, stirring, then add the wild garlic leaves and simmer for 2 mins.
Remove from the heat and blend using a stick blender or tip into a blender. Return to the heat and stir through the milk, then taste for seasoning. Ladle into bowls and drizzle over a little extra oil, then top with a few wild garlic flowers, if you have them.