Preheat the oven to 150° C w/ fan.
Line the loaf tin w/ baking paper.
Clean & pat dry the blueberries; roll in some flour (if you like).
Grate the lemon zest.
Mix butter, sugar, salt & lemon zest w/ your electric handheld mixer until soft.
Add eggs.
Add flour mixed w/ baking powder.
Add yoghurt - all w/ the electric handheld mixer.
Now fold in lemon curd & blueberries w/ a spoon.
Pour the mess in the loaf tin & bake for about 70 min.
Make the famous test w/ the wooden pin...
Let the cake cool in the tin; remove the tin after about 10-15 min.
Let the cake cool down completely.