Begin by setting out all of your equipment, so that everything is at hand for when thing start happening quickly towards the end of the process- make sure the lined tin, thermometer, whisk and spatula are all at hand, near the hob.
Sieve the bicarbonate of soda into a small bowl or measuring cup. Set it near the hob, so it is easily accessible. Add the sugar, golden syrup and glucose syrup to the saucepan and set over medium-low heat.
Allow the sugar to melt, giving it a gentle stir, if needed, to help it melt evenly. Try not to stir too much, though, or it might crystallise. Once the sugar has melted, keep an eye on the temperature using the candy thermometer and allow the mixture to bubble away until it reaches 153°C.
At this point, you need to work very quickly. Remove the pan from the heat and immediately add the bicarbonate of soda. Vigorously whisk in the bicarb- the sugar will froth up violently, so be very careful. Once all of the bicarb has been mixed in, quickly tip the mixture into the lined tin, using a spatula to scrape the sides (don't worry if you can't get it all- just try to get most of it). Leave the honeycomb until it is just about cool, about 10-15 minutes, (see Note 2)- it should be hard to the touch- then break up into pieces using your hands.
At this point, the honeycomb can either be eaten immediately or transferred to an airtight container, where it should keep for a few days (as long as it is not exposed to any moisture). To prolong the shelf-life of the honeycomb (and make it extra tasty), you can dip it into chocolate. Melt and temper the chocolate, then use 2 forks to dip each piece of honeycomb into it, making sure that the honeycomb is completely covered. Transfer the dipped toffee to a baking tray, lined with greaseproof paper and allow to set at room temperature until the chocolate has hardened. Store in an airtight container until ready to eat.