This plug is on a 4-gang extension lead that was overloaded, and so it overheated and melted - this was not in an industrial environment as you'd expect but an office in Newcastle upon Tyne. This may not look like much but big problems often start off small; this has likely been caused by the lead being pulled to unplug it. We replaced the plug. It's not just problem plugs we come across; this socket is testament to that. This socket like many others specially installed in an office was intended to supply power to computers, not to oil filled radiators. This plug is on an "IEC lead"; a computer power lead - which requires earth protection. By putting an insulated sleeve on the earth pin the manufacturer has removed the earth protection. This is a regular occurrence on leads imported from Asia, where they don't use earth protection. This microwave oven failed because it was so, well disgusting! This is a mix of rust and food. Here is a good example of a broken plug on a fan heater; we come [...]