Finely dice the bacon and add to a large soup pot with the butter, fry until crispy
Finely slice the onion and leek, crush the garlic cloves. Add to the soup pot with the bacon and cook for 3-4 minutes
Peel and finely dice the potatoes, add to the soup pot
Add the vegetable stock powder, garlic powder, onion powder, dried parsley and cornflour to the soup pot with the milk and 4 cups of water. Stir and cover, bring to the boil, then turn down to a simmer and cook for 1 1/2 hours, stir occasionally