Preheat the oven to 150°C/300°F (without fan).
Line a few baking trays with baking paper.
In a large mixing bowl, combine the rolled oats, flour, sugar, coconut and salt.
Dissolve the baking soda and warm water in a small bowl.
Add the baking soda mixture to the dry ingredients.
Add the melted butter and golden syrup to the dry ingredients.
Use a wooden spoon and give everything a good stir.
Pinch a small piece of the mixture (about 1 tablespoon), roll it into a ball.
Place the balls of dough onto the lined baking tray.
Flatten the balls of dough into a circle and use your fingers to nicely shape the edges.
Repeat with the remaining mixture.
Make sure you leave a good 5 cm (2 inches) between each flattened biscuit to give them room to spread (these cookies spread a bit in the oven, but do not rise so much).
For crunchy biscuits, bake for 13-20 minutes, depending on the size of your biscuits, or until dark golden brown. If you prefer chewy biscuits, bake them for less time until they are light golden in colour.
Leave the biscuits on the tray for several minutes until they have firmed up, before removing them to a wire rack to cool completely.