Preheat the oven to 180 °C/ 350 °F. Grease two baking trays with a little sunflower oil.
Measure out the self raising flour, sugar, oats and bicarbonate of soda into a large mixing bowl and stir to combine.
Measure out the vegan margarine and golden syrup into a small pan and cook over -medium-low heat, stirring every few minutes, until melted.
Pour the melted margarine mixture into the mixing bowl with the dry ingredients. Use a wooden spoon to stir the wet ingredients into the dry until a dough forms.
Take 1/2 tbsp of the dough at a time, roll into a ball, and flatten slightly. Place the cookie dough balls on the baking trays 1 inch/ 2.5 cm apart. Bake the oat cookies one tray at a time, for 7-8 minutes on the middle shelf of the oven until golden.
Repeat until the rest of the dough is used up. Leave the cookies to cool slightly on the tray before serving warm!