Savoury Lentil and Nut Loaf

Name: Savoury Lentil and Nut Loaf
Yield: Serves 4
Ingredients: 2 celery sticks, finely chopped; 2 garlic cloves, crushed; 115 g/4 oz/1 cup mixed nuts, such as hazelnuts, cashew nuts and almonds, finely chopped; 425 g/15 oz can brown lentils; 50 g/2 oz/½ cup plain (all-purpose) flour; chives and sprigs of fresh flat leaf parsley, to garnish; 45–60 ml/¾ tbsp chopped fresh mixed herbs; salt and ground black pepper; 1 onion, finely chopped; 1 leek, finely chopped; 225 g/8 oz/3 cups mushrooms, chopped; 30 ml/2 tbsp olive oil, plus extra for greasing; 1 egg, beaten; 50 g/2 oz/½ cup grated mature (sharp) Cheddar cheese