Rub the chicken pieces all over with salt and pepper. Heat the olive oil in a large saucepan, add the chicken and seal well all over.
Add the onion, garlic, chilli and herbs and cook for a couple of minutes on a medium heat. Add the wine, increase the heat and allow the wine to evaporate slightly. Add the diluted tomato purée, then stir in the cherry tomatoes. Reduce the heat to low, cover with a lid and cook gently for 1¼ hours, until the chicken is cooked through; the flesh should come away from the bone and there should be no sign of pink when you pierce the thickest part. Serve hot.
For a slow cooker
Heat the oil in a large deep frying pan and cook the chicken as above. Continue as above, add the tomatoes, plus 300ml/10fl oz/1¼ cups chicken stock. Bring to the boil, then transfer to a large slow cooker pot. Cover and cook on Low for 7–8 hours or until there are no pink juices when the chicken is pierced with a small knife.