My attempt! 
Looks like the real thing! 
Filling with lots of chicken
So Greggs published the ingredients with no measurements to make their chicken pasty https://www.delish.com/uk/food-news/a32248039/homemade-greggs-chicken-bake-recipe/
I decided to have ago and apart from being too salty it was excellent! I didn’t write down the measurements and bought ready made puff pasty. I will make it again one day and remember to write down some measurements.
The Ingredients
- Puff pastry
- Chicken
- Chicken stock
- Corn flour mixed with a little water
- Double cream
- Cream cheese
- A beaten egg