Mix all the dry ingredients together in a large bowl and add the water and oil.
Pour the mixture onto 2 baking trays (26cmx40cm approx.), it should be the consistency of porridge.*
Spread it as thinly as possible (the thinner the better - pic 2) and bake in the oven for 15 minutes (the spreading takes ages; I use a soft spatula).
Remove tray and cut into pieces in baking tray as desired - either cracker size or larger rectangles (pic 3). Put back in the oven and bake for 1-2 hours until they are golden and crisp. I do 1hr 30.
They should look a bit golden, not greyish and be crunchy. If they are cardboardy cook for longer.