Leek, bacon & potato soup

Name: Leek, bacon & potato soup
Cook time: 30 min
Total time: 30 min
Cuisine: British
Ingredients: 25g butter; 3 rashers streaky bacon chopped; 1 onion chopped; 400g pack trimmed leek sliced and well washed; 3 medium potatoes peeled and diced; 1.4l hot vegetable stock (we used low-sodium); 142ml pot single cream; 4 rashers streaky bacon to serve