Er. Well. It came out sort of bread shaped.
Actually, appearance and flavour both good and very similar to Lidl HP BUT it is a pretty solid lump, and also had a slightly ??slimy texture - not unpleasant, just a bit odd. But it is quite edible (for a given definition of...). Did I mention that total net carbs came to 73gc? (sorry - the net carbs in the total recipe!) Will get at least 8 slices so 4.5gc per half slice. And it toasts well.
Next trial - much more water, and I think I might soak the chia seeds and the linseed for five minutes or so in half the water. Ten grams less chia, ten grams more oat bran to reduce the slipperiness. And grind the sunflower seeds & linseeds a bit more thoroughly.
Other possibilities - add in some baking powder to help aeration. Find a cheaper substitute for the soy protein, anyone know if whey protein would work as well? FYI total cost of the the loaf was about £3.50 which is too much IMHO.