Potatoes and celery soup (vegetarian)

Ingredients

• 2 (about 150g) potatoes - remove skin and cubed
• 2 sticks of celery - sliced
• 1/2 litre vegetable stock (made from carrots and onions)
• 5 garlic - chopped
• 2 stalks of spring onions - sliced into 1 inch length
• 2 bay leaves
• 1 tsp dried thyme
• 1 tsp dried parsley
• 2 tbsp oil
• salt and pepper to taste