I tried to PM you, but your inbox is full.
UPN made 10oz balls, best I could tell. The recipe makes 1.7kg (assuming no waste). If you make 10oz balls (~280g), you should get 6. If I remember right, the pies in the pictures were a little larger than that - closer to 325g which would yield 5 pies and a little extra dough. I think the pies in the picture were about 14" before baking.