Good background on theory
Good instructions, and the photos were very good. However, a few points:
1. I've always noticed with puff pastry recipes that initially there is a high proportion of fat to flour. My guess is that you are supposed to make up for the low flour when you are doing the turns. But I think I overdid it with the added flour and my pastry didn't rise, although it wasn't oily, like the last time I tried puff pastry. So: it would be good to suggest an amount of flour to use for the turns.
2. It would be good to put the flour amounts in weights. My mother was English so I have scales and it's just way more accurate to measure nearly everything (except the teaspoons, obviously) by weight. Especially when you want to halve or double.