Lightly coat chunks of stewing beef with flour and a pinch of salt and pepper
In a hot pan with a little oil, brown the beef on all sides for a couple of minutes. Do this in batches if needed. Transfer the beef to the slow cooker.
Turn the pan down to a medium heat. Add a little more oil, then sauté diced onions, carrot and celery for 4-5 minutes, or until softened. Add minced garlic and cook for a further 2-3 minutes. Then transfer the contents of the pan to the slow cooker.
To the slow cooker also add beef stock, Worcestershire sauce and fresh thyme.
Cook for 4 hours on high or 7-8 on low.
After the slow cook, remove the lid. Crumble in stilton and stir until melted.
Keep the lid off while you prepare your pastry and preheat the oven to 200°C (or fan 180°C). If your filling starts to cool that's OK. It will continue to thicken and also means the pastry will be less soggy underneath when you cook it.
Transfer the contents of the slow cooker to pie dishes. Top with shortcrust pastry. Brush with egg wash and pierce a couple of air vents into the pastry.
Cook in your pre-heated oven (200°C, or fan 180°C) for 15-20 until golden brown, or according to instructions of your pastry.