Preheat oven to 200°C/400°F. Line the base of two medium sized bread tins with baking paper.
In a large bowl, mix together the flour, salt, flaxseed and yeast.
Roughly mix the water into the flour. While the dough is still craggy, add the olive oil and give it a good mix.
Knead the dough for several minutes, using a little extra flour to stop it sticking to your hands.
Divide the mixture into the two bread tins. Cover with a clean tea towel and leave somewhere warm for 25 minutes to rise.
Bake for 40-45 minutes. Turn out the loaves onto a wire rack and allow to cool for at least 5 minutes before serving.
Store in an airtight container at room temperature for up to 5 days.