Traditional Irish stew

Name: Traditional Irish stew
Prep time: 1 h
Cook time: 2 h
Total time: 3 h
Cuisine: British
Ingredients: about 1kg/2¼ lb scrag end or neck of lamb on the bone; 2 carrots; 1 large onion; 2 celery sticks; 1 leek; 2-3 garlic cloves, crushed; 1 large bay leaf; 1 large sprig fresh thyme; sea salt and freshly ground black pepper; 150g/5oz small carrots; 150g/5oz baby or pickling onions; 1 large floury potato, about 300g/10oz weight, peeled and diced finely; 2 spring onions, thinly sliced; a little fresh chopped parsley