Parma Ham and Wild Mushroom Beef Wellington

Name: Parma Ham and Wild Mushroom Beef Wellington
Prep time: 40 min
Cook time: 1 h
Total time: 1 h 40 min
Cuisine: British
Ingredients: 750g beef fillet, trimmed; 3 tbsp olive oil; 1 ½ tbsp English mustard; 300g wild mushrooms, finely chopped; ½ tsp thyme leaves; 10 slices Parma Ham; 100g Brussels paté; 500g ready rolled puff pastry; 1 egg, beaten; Pinch of cracked black pepper