Preheat oven to 180 degrees.
Grease a standard sized loaf tin and set aside.
Place the dates into the Thermomix bowl and press Turbo for 5-10 seconds to roughly chop.
Add the boiling water and bi-carb soda and mix on 100 degrees, Speed soft, 2 1/2 minutes (watch it carefully as it will bubble up in the bowl).
Add the butter and raw sugar and mix for 10 seconds, Speed 6.
Scrape down the sides of the bowl.
Allow to cool slightly.
Add the egg and mix on Speed 3 for 5 seconds.
Add the self raising flour and plain flour and mix on Speed 7 for 5 seconds.
Scrape down the sides of the bowl and mix for a further 5 seconds on Speed 7.
Pour the batter into the prepared loaf tin and bake for approximately 50 minutes (check after 40 minutes), or until a skewer inserted into the middle comes out clean.
If the loaf is browning too much, loosely place a sheet of foil over the top and continue baking.
Allow to cool for 20 minutes in the tin before turning onto a wire rack to cool completely.