Sprinkle the dried mixed herbs, pepper and flour onto a plate and mix. Roll the cubes of pork in this mixture. Preheat the oven to 180C (160C fan, gas mark 4).Heat the oil in a flameproof casserole dish. Add the pork, onion, celery and apple, and cook for about 5 minutes, stirring well.Add the stock and bring to the boil. Once bubbling, remove from the heat, cover and cook in the oven for 75 minutes.Once the casserole has been in the oven for about 70 minutes, make the topping. Mix together the low-fat spread and garlic, then spread on the slices of bread.Remove the dish from the oven. Arrange the bread on top of the casserole, spread-side up, and sprinkle over the cheese. Return to the oven, without a lid, to bake for another 10 to 15 minutes until browned.Once cooked, leave to cool for a few minutes before dividing into bowls. Tuck in and enjoy!