Preheat the oven to 190°C, 180°C fan assisted, Gas mark 5.
In a pan, fry the mince until browned. Blend contents of the sachet with the water and add to the pan with the tomatoes. Bring to the boil whilst stirring, then simmer for 1 minute.
Beginning with the beef sauce, place alternate layers of beef and pasta into an ovenproof dish. Top with a layer of white sauce, sprinkle with the cheese and bake for 35-40 minutes until golden and bubbling.
Delicious with a mixed salad.