Boil the potatoes until soft but not breaking.
Drain the potatoes in a colander and put to one side.
Place the milk and butter in the pan used to boil the potatoes, return the pan to the heat and warm gently until the butter has melted into the milk.
Add the potatoes and mash.
Whip the mashed potato lightly with a wooden spoon. Season with salt and pepper to your taste.
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