Prepare the cake tin by lining with baking parchment and tying brown paper around the outside.
Preheat oven to 140°C/270°F/Gas Mark 1
Beat margarine and brown sugar together until creamy.
Beat in the treacle
Add in the apple sauce
Mix the flour with all the remaining ingredients except the brandy and Aquafaba
Gradually add into the creamed mixture
Stir in the Brandy and Aquafaba
Place the mixture in the cake tin
Smooth the top with a spoon and make a slight hallow in the centre of the top
Bake for 3 hours but check after 2½ hours as ovens vary
Allow to cool in tin for 15 minutes before removing and coolng on a wire tray