I have an old American lamp & am being told different reasons why I can't just change the plug & bulb! I have always understood that the wiring has to be changed as UK is greater than US! because the lamp has metal tubing to attach to the main lamp it needs to be earthed! I have new 3 core,but will I need to change all the switches etc? I would love to find a 'local' electrician who could help me,but they don't exist in central London anymore!