You can substitute Vegemite for Marmite if your a veggie and its a lot cheaper in the UK than Marmite! This recipe is from 1942.
I lb. wholewheat flour
1 dessertspoon Marmite
4ozs cooking fat
Little cold water
Put flour into cold basin. Rub in fat until it looks like fine breadcrumbs. Add water a little at a time to the dry ingredients to make a firm dough. When well mixed, turn on to a floured board. Roll out thin. Now spread over thinly with Marmite, fold over and roll out again.
Spread with more Marmite, fold over and roll out.
Cut into rounds or fingers, bake in moderate oven until crisp and brown.