Prepare your tin (round or square) by lining it with a baking parchment
Mix the flour, salt, baking powder and baking soda together in a medium sized bowl.
Add the cornmeal and mix in to the flour.
Melt the butter and let it to cool down a bit.
In another bowl or a measuring jug, mix the buttermilk, melted butter and egg and sligthly whisk it together.
Pour the buttermilk mixture into the flour mixture and mix together, but don't over mix it.
Pour the batter into your prepared tin and place in the oven (middle shelf)
Bake innitially for 10 minutes on 190C (375C) and then reduce the oven temperature down to 180C (350C) or Gas mark 4. Bake for another 15-20 minutes until the cornbread is lightly golden/brown on the top. Check with a wooden skewer to see if the cornbread is ready (if it comes out clean/dry it's done)
Leave to cool down in the tin for about 10 minutes (resting on a cooling rack) and then take out completely and place on the cooling rack. If you can peel of the baking parchment, do this now to prevent the cornbread sweating.
Serve as a side dish/bread with your main meal.
Notes
The calculated calories are based on one slice, providing that you divide the cornbread into 12 slices.