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Heat oven to 200C/180C fan/gas 6 and line a baking sheet with baking parchment. Put the flour, seeds, bicarbonate of soda and a pinch of salt in a large bowl and mix to combine. Stir the treacle into the yogurt mixture and, when the treacle dissolves, pour onto the dry ingredients. Stir together with the blade of a knife until you have a soft, sticky dough. Leave for 5 mins (this allows time for the liquid to absorb into the bran).
Tip onto a lightly floured surface and form the dough into a round about 18cm across. It will still be very sticky, so don’t over-handle it – treat it like scone dough rather than bread dough. Lift onto the baking sheet and bake for 25-30 mins until the crust is golden and the loaf sounds hollow when tapped underneath.