Kim's Baked Potato Soup

6 baked potatoes
6 cups milk
2/3 cup flour
1 cup sour cream
2 cups cheese
1/2 pound bacon (precooked bacon is best)
2/3 cup butter or margarine
1/2 tsp pepper
1 tsp salt

Peel and quarter potatoes.  Mash with a potato masher or fork.  Melt butter in large pot.  Add salt and pepper.  In a separate container, combine four and 2 cups milk.  Wisk together well and add to butter.  On low, heat through and add remaining milk.  Then heat through and add potatoes.  Crumble bacon, add and simmer, stirring constantly.  When soup begins to thicken (about 30 minutes), add cheese.  Stir to melting, then add sour cream.