1). Make a pizza hut account online
2).order £20 worth of food to a random house or flat.
3) they way it works is that for any £10 you spend on pizza, you get a slice for rewards. Once you have 10 slices
you get a free large pizza and so on
4). When it comes to payment choose cash.
5). The slice updates every hours
6). If you have 50 slices, you can order 5 large pizzas and make money of it.
7). This is a collection only method
8). When doing the food, make sure it's £20 not 19.99 
ENJOY FREE PIZZA FOR LIFE