Burgen Soya & Linseed Bread (800g loaf): 1 slice has Calories 124, Sodium 130mg, Total Fat 4g, Total Carbs 12g, Sugars 2g, Protein 7g. Price in Asda: £1.40, I think Sainsbury's is £1.50.
They also do a 400g loaf which has slightly smaller slices and other breads such as a Buckwheat and Poppy...