Lay the veal flat between greaseproof paper and beat gently to flatten. Cover each piece of veal with a slice of ham or bacon. Mix together the breadcrumbs, sultanas, nuts, cheese and parsley, and season with salt and pepper to taste. Divide between the veal slices, roll up and secure each one with a cocktail stick. Heat the oil and butter in a pan, add the veal rolls and fry until lightly browned. Pour in the wine, cover and cook very gently, turning once, for 20 to 25 minutes until tender. Transfer the rolls to a warmed serving dish and keep hot. Bring the pan juices to the boil, stirring, and cook until well reduced. Spoon over the meat, garnish with parsley and serve immediately.