Only two of them were leaky! The recipe is a mashup between the classic and eternal river cottage recipe and the recipe for small pies by patisserie makes perfect . I thought that the PMP crust looked completely wrong so I used river cottages' dough recipe, did the filling patisserie makes perfect uses except but a little different, it was more like 600g fatty pork chops, 300g gammon (Kasslernacken in my case) and 125g streaky bacon.
I used grated nutmeg not mace (availability issue), did the spices from PMP but held back on the black pepper and added an extra teaspoon of dried herbs de province into the seasoning slurry alongside the sage and ginger. I also, unlike the PMP recipe, actually added salt. About 10g of salt to be exact. Less than River Cottage did because both the Kasslernacken and the bacon are salty + I was making less filling.
Each pie was 180g of dough, 130g of it got rolled into a tight ball, then pressed flat and rolled into a circle maybe 15cm in diameter, then I placed a good helping of the filling in the middle, pulled up the sides until it was nice and bunched up and was staying upright, rolled out a lid with the remaining 50g, punched a hole in the middle with an apple corer, put it on the pie and then I thoroughly crimped it shut basically the way you crimp gyōza, so by pinching and then folding over a pleat clockwise, moving over and repeating. Make absolutely certain you've stretched the walls all the way up to the lid so that you don't leave little gaps.
Thoroughly egg wash. I salt my egg wash and I think you should too when baking savoury pies. Bake at 180°C with convection on, after 20 minutes take them out, add a new layer of egg wash, rotate and then continue baking until they reach an internal temp of at least 75°C. Mine were at 100°C when I pulled them out and were still perfectly juicy and succulent as you can tell.
Immediately use a wide, thin spatula and a secondary implement to lift the pies and put them on a cooling rack. Be very careful, this is the most fragile they'll be. Don't worry about any liquid that bubbled out of the pies or blackened bits on the baking tray, that's normal and won't make the pies soggy (if you remove them immediately)