Where can I buy heatproof cable to replace the ordinary cable on my soldering iron?
Silicone heat resistant cable is sold in 1.5 metre lengths for exactly this purpose by Rapid Electronics, part number 85-0590 (look in the Soldering Equipment section). If you use another supplier make sure you buy 3-core mains flex with a current rating of 3A (the proper name for mains appliance leads is flex, not cable). Please note that to change over to the new flex you will need to borrow a second soldering iron! This is because the flex is soldered to the iron’s element. Make sure that you connect the wires correctly in the iron and in the mains plug which should have a 3A fuse.