In a large mixing bowl, mix the flours with the cereals, seeds and salt
Make a well in the centre
Put the yeast into a measuring jug and make into a smooth liquid with a little of the water and pour into the well in the flour
Add the olive oil and remainder of the water
Gradually work the dry mixture into the liquid to make a soft, slightly sticky dough - it should not stick to the bowl or your fingers, so add a little more water if necessary
Turn out onto a floured work surface and knead well for 10 minutes
Return the dough to the bowl and cover with a damp tea towel or put the bowl into a large plastic bag and close tightly
Leave to prove at room temperature until the dough has doubled in size - about 2 hours
Knock back the risen dough with your knuckles to deflate it, then turn out onto a work surface
Pat out into a rectangle the length of your banneton or greased tin before putting it into the container
Cover and leave to rise again until almost double in size - 1-1½ hours
Towards the end of the rising time, preheat the oven to 220ºC/425ºF/Gas mark 7
Uncover the dough (if using a banneton, carefully tip the dough out on to a greased baking sheet) and bake for 35 minutes until it turns golden brown and sounds hollow when tapped on the bottom of the loaf
Cool on a wire rack for at least half an hour before slicing & serving