Preheat the oven to slow (150°C/130°C fan-forced).
Combine the oats, sifted flour, sugar and coconut in a large bowl. Combine the butter and golden syrup in a pan, stir over a low heat until the butter is melted.
Combine the soda and water, add to the butter mixture; stir into the dry ingredients while the mixture is warm.
Roll 1 heaped teaspoon of mixture into a ball; repeat with remaining mixture, placing the balls about 4cm apart on greased oven trays. Flatten balls slightly and bake in a slow oven for about 20 minutes or until golden brown. Loosen the biscuits on the tray while warm; cool on trays.
Suitable to freeze. Butter mixture suitable to microwave.