Soften onions. Add leeks, grated carrot, chopped carrot, peppers and garlic. Soften for 5 mins on a low heat. Add chicken and chorizo and cook until colours. Then add tomatoes, herbs and spices. Simmer for 5 mins. Add stock for desired consistency. Season to taste with salt & pepper, and Worcester sauce. Simmer for 45 mins. Add black olives 10 mins before serving. Serve with fresh crusty Sourdough bread.