Place washed, peeled and cubed potatoes in a large pot. Use large chunks of potatoes if you like chunky mashed potatoes and smaller if you like smooth potatoes. Cover with cold water, and bring to a boil over high heat.
Bring to a boil and cook for approximately 10 - 15 minutes until you can easily poke through a potato with a knife. Drain well, and return to the hot pan. The secret to great fluffy mashed potatoes is getting the liquid out. Returning them to the pan helps dry them out.
Add butter, salt and pepper, and half of the milk. With a fork or potato masher, mash the potatoes to desired consistency. Add more milk, salt and pepper and continue to mash. Taste, and season as needed. Keep in mind the bangers will be salty, so don't over do it.