Preheat the oven to Gas Mark 6, 200°C (400°F). Mix the flour, bread soda and salt together in a bowl. Combine the egg with the buttermilk and honey then mix into the flour. Add a little more buttermilk if the mixture is dry – it should be a soft dough. Then pour the lot into a lightly oiled loaf tin. Sprinkle the sesame seeds or porridge oats over the top of the loaf if using. Bake for 45-50 minutes. To know when it is cooked simply tap the bottom of the loaf – it will sound hollow when it is fully cooked. Remove from the tin and wrap in a clean tea towel while cooling. This will keep the crust soft.