This recipe calls for golden syrup, which is not the same as corn syrup. Corn syrup is made from corn(starch), whereas golden syrup is made from sugar. The flavour is also different. Corn syrup has a very mild flavour, whereas golden syrup has a more pronounced buttery caramel flavour.
Golden syrup is available
easily online and is worth seeking out for the unique flavour and texture it adds to these cookies.
If you are going to use edible gold leaf flakes, I highly recommend buying an
inexpensive set of bamboo tweezers for applying it. Metal tweezers cause too much static cling.