Becky's Favorite Oxtail Stew (Crowd Cow)

Ingredients

• 2.5 kg oxtail , chopped into 4cm chunks
• Olive oil
• 2 medium leeks
• 2 sticks of celery
• 4 medium carrots
• Few sprigs of fresh thyme
• Few sprigs of fresh rosemary
• 4 fresh bay leaves
• 4 cloves
• 2 heaped tablespoons plain flour
• 2 x 400 g tins of plum tomatoes
• 275 ml porter or red wine
• 1 litre organic beef stock , optional
• Worcestershire sauce