Line a baking tray with baking paper.
Put the golden syrup and caster sugar in a large saucepan and place over a medium heat. As they melt, stir them together, but once combined leave to heat without stirring.
Put your thermometer in the pan and when the mixture has reached 150℃/302F, and is bubbling very hard, sprinkle over the bicarbonate of soda and take the pan off the heat.
You will need to work quickly here: beat the mixture until it starts to foam, then pour it onto the lined baking tray and leave for 1-2 hours to fully harden. Be careful, it will be VERY hot.
Cut or break into the bite-sized pieces.
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